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This is a list of characters from the animated television series ReBoot.

Most ReBoot characters are named after technical computer terms or pieces of computer hardware.

Bob (voiced by Michael Benyaer in seasons 1 and 2 and late season 4, Ian James Corlett in seasons 3 and 4) is Guardian 452 and the defender of Mainframe from both internal and external threats.^[1] Bob is often criticized by other Guardians for his unorthodox views regarding viruses: unlike other Guardians, who believe that viruses should simply be deleted on sight. Bob theorizes that viruses can be reprogrammed to live as Sprites, citing Hexadecimal as proof of his theories. Despite the difference in their personalities, he and Dot developed romantic tension that results them becoming a couple at the end of Season 3. Bob is equipped with a Guardian Keytool, "Glitch", which can transform into any device with a voice command.

Michael Benyaer returned near the end of season 4 as the voice of the fake Bob and eventually as the voice of the real Bob, which led to a tongue-in-cheek comparison between the two where Dot commented that fake Bob "even sounds more like the real Bob".

Bob's name was chosen by the members of the production team after they saw an episode of British sitcom Blackadder, and were amused by the way actor Rowan Atkinson pronounced the name Bob.^[2] It is also short for Blitter objects, a graphic element in Amiga computer systems.

Dot (voiced by Kathleen Barr) is the daughter of leading Mainframe scientist Welman Matrix, who was originally his assistant as a teenager. Now an adult and proprietor of Dot's Diner, Dot acts as Enzo's surrogate parent and guardian since the loss of their father, with their mother's fate being unknown. She later becomes the command.com of Mainframe in place of Phong.^[3] She is admired for her brilliant and invaluable tactical skills, which led to her becoming a workaholic with business interests in most of Mainframe. Dot and Bob have a long-standing attraction to one another, sometimes leading to awkward moments between them.

Dot's name is derived from dot matrix, a two-dimensional patterned array, used to represent characters, symbols and images.

Enzo (voiced by Jesse Moss for the first ten episodes of Season 1, Matthew Sinclair for the final three episodes of Season 1 and the entirety of Season 2, Christopher Gray for the first four episodes of Season 3, and Danny McKinnon in a flashback during Season 4) is Dot's little brother, who hero-worships Bob and intends to become a Guardian. He has a crackling, mid-pubescent voice and often uses catch-phrases such as "alphanumeric" and "high-density" in place of real-world expressions like "cool" and "awesome" to express enthusiasm. Enzo is energetic and loves to play games like Jet Ball and Circuit Racing. He enthusiastically enters Games, which he proves to be skilled at despite his youth.

Matrix (voiced by Paul Dobson) is an adult version of Enzo who aged quicker due to the dimensional difference of the game world, making the time frame in the game world seem longer than it actually is. Ashamed of the child he used to be, whom he viewed as weak after his vicious defeat by the User Zaytan, he prefers to be simply known as Matrix. Having a cold and gritty personality, violent behavior, and a muscular physique, he is nothing like the child he used to be, having been tempered by a lifetime of fighting. Although he is quick to anger, he has shown a desire to help those in need, and his quest to return to Mainframe has let him bring many systems back from the brink of annihilation.

Little Enzo (voiced by Christopher Gray in Season 3, Giacomo Baessato in Season 4) is a new Enzo who looks up to his older self as much as he does Bob, and briefly wanted to be just like him and demanded everyone call him "Little Matrix". When Daemon took over Mainframe, Enzo, wearing the Guardian uniform that Bob gave the original Enzo in season two, saved the System with the help of Frisket, Hack and Slash, allowing Matrix to snap out of Daemon's infection and help disinfect others so they could fight the virus.

Frisket is a robotic dog who is Enzo's pet and acts in a threatening manner toward everyone other than Enzo and AndrAIa, with a particular dislike of Bob. Frisket has uncanny physical strength, comparable to that of Megabyte, being known to catch cannonballs and ABCs in his teeth. Frisket is extremely loyal to Enzo and would not hesitate to sacrifice his life to protect him, following him and AndrAIa into the games during season three.

His name is derived from the masking technique that is used by artists.

Phong (voiced by Michael Donovan) is an old and wise sprite who acts as System administrator and keeper of the core for Mainframe. He was also the command.com of Mainframe before passing the title to Dot. He is somewhat the evocative of Confucius and often dispenses advice in the form of confusing and vague philosophical quotes gleaned from old README files.

The character Phong's name is an allusion to the game Pong—he has a rule that any who seek his advice must first play him in a game of physical Pong, shown on-screen in the first few episodes—and to Phong shading, an interpolation method named after computer scientist Bui Tuong Phong used in three-dimensional graphics rendering.^[4]

The main antagonist of the series, Megabyte (voiced by Tony Jay) is a virus, originally operating out of the Silicon Tor in Sector 1000 and dominating most of G-Prime. Megabyte plots to corrupt and control Mainframe and turn it into his own domain, "Megaframe", and from there infect the Super-Computer and then take over the entire Net.

His secondary objective is to destroy his sister Hexadecimal, who he has sibling rivalry with. He has a brutal, almost psychopathic nature and speaks with a British accent. Megabyte possesses enhanced strength, agility, and retractable claws. Megabyte is able to infect and control objects as well as read memory from certain sprites.

His name is a reference to a megabyte.

Nibbles is Megabyte's pet null, whom he refers to as "Father". Nibbles' identity as a Sprite is not revealed until the fourth season.

His name is a reference to a nibble or nybble, 1/2 of a byte.

Hack (voiced by Phil Hayes in season one, Scott McNeil in season two) and Slash (voiced by Garry Chalk) are twin robots, identical in form except for their colors: Hack is red and Slash is blue. They serve Megabyte, carrying out his orders, often in an incompetent manner. Hack and Slash have great physical strength.

Their names are a reference to the hack and slash genre of computer games, and the keyboard characters \ (hack) and / (slash).^{[citation needed]}

Hexadecimal (voiced by Shirley Millner) is the self-proclaimed "Queen of Chaos", a virus operating out of Lost Angles. She is Megabyte's sister, serving as the chaos to his order. Her origin is revealed in the fourth season. She and Megabyte were once one virus, Killabyte, who was scheduled for deletion by the Guardians, but upgraded to Gigabyte before it could be carried out. He mortally wounded Bob's partner and prepared to attack Bob before being accidentally teleported away by Welman Matrix's gateway device. This caused the destruction of Mainframe's twin city and the creation of Lost Angles, everyone present being nullified, including Welman, who became Nibbles, and Gigabyte being split into Megabyte and Hexadecimal. Hexadecimal is melodramatic and extremely emotional, able to switch emotions by a simple wave of her hand, which changes the noh-styled mask she wears, and her emotions along with it.

Her name is a reference to hexadecimal notation.

Scuzzy is Hexadecimal's familiar, who resembles a disembodied floating cat head with an obloid crystal ball attached. Scuzzy is mute, but fully aware of its surroundings and will admit to Hexadecimal's erratic behavior. Scuzzy is named after SCSI, a set of computer and peripheral connection standards.

The User is the human operator of Mainframe, who is perceived by its denizens as a distant, impersonal, deity-like figure. Often destructive, it subjects the city to Game Cubes and assumes various avatars to do deadly battle with those trapped within them. The User is a computer owner who enjoys playing PC games, blissfully unaware of the havoc they are causing.

Cecil is a video screen with a pair of arms, who was a waiter at Dot's Diner before it was destroyed. He refers to himself as a "dedicated server", a play on his waiter job and Server (Computing). He greatly resembles the original Apple Macintosh, and his icon has rainbow stripes resembling the Macintosh logo. Cecil was originally limited to moving along a rail within the Diner; in other words, he was nearly sessile. After the Diner's destruction, Cecil's rail arm was attached to a hoverboard, allowing him freedom of movement.

Al is a one-binome and the owner of Al's Diner, also known as Al's Wait & Eat on Level 31, and also serves as cook. According to his waiter, Al runs at 3 decahertz (30 Hz). Almost never seen, the only times he is explicitly shown on screen is when he is tied and covered up with rope in the episode "The Great Brain Robbery", and jumps in front of the camera in the third-season finale after the system is restored.

Al's Waiter (Front Counter)

Never named in the series, he is a binome that stands behind the counter at Al's Diner.

Al's Waiter (Roller Skater)

Also never addressed by name, he is a flamboyant one-binome who acts in a stereotypically camp manner.

Mike the TV is an annoying, ambulatory television set from Bob's apartment who speaks into a mic and pitches bizarre products like the famous Bucket-O-Nothing, free for only $99.99.99, rambling until somebody tells him to stop. He irritates the cast, but cannot be turned off due to his remote control running away. In later seasons, he stars as a war correspondent for Mainframe, and, while infected by Daemon, becomes a televangelist.

Herr Doktor and Bunnyfoot are Megabyte's one-binome evil scientists, whose practices are disturbingly unethical. The Doktor speaks in a distinct German accent and greatly reveres Megabyte. occasionally referring to him as "mein Führer". The Doktor's hands are unlike other binomes'; instead of mitten-like hands, he has fingers. This distinction is featured as comic relief in the series, as his fingers are often injured. Unlike the other Virals, he retains his Viral status and colors after Mainframe is restarted. Herr Doktor's assistant Bunnyfoot is, in relation to other binomes, anatomically dishevelled, being a one binome rather than a zero binome and having his eye portion in the middle. He also has a brick as a foot, referencing Igor, the assistant of Doctor Victor Frankenstein.

Old Man Pearson (voiced by Long John Baldry) is a cranky old binome with an Irish accent who runs a waste disposal system analogous to a Windows Recycle Bin and data dump in Sector 1001. He was once a Codemaster known as Talon. As a Codemaster, Pearson uses a Gibson Coil Pike weapon.

Captain Gavin Capacitor (voiced by Long John Baldry) is a software pirate and captain of the Saucy Mare, who styles himself as "the Crimson Binome". Capacitor is a one-binome with a hook for a left hand and a peg leg in place of his right leg. He is a pirate stereotype, using phrases derived from pirate catchphrases like "Shiver me templates!" and "By the code!" At heart, he is a romantic, driven at times by a sense of honor, comradeship, and a desire to never go down without a fight.

Gavin Capacitor is named after capacitors, an electronic component, and ReBoot co-creator Gavin Blair.

Mr. Christopher

Mr. Christopher is a nerdy and timid zero-binome who is Captain Capacitor's bookkeeper.

Princess Bula

Princess Bula is a giant one-binome on Captain Capacitor's crew, who is strong but unintelligent.

Miss Sally

Miss Sally is a female zero-binome pirate who serves as raider and look-out for the Mare.

Mr. Andrew

Mr. Andrew is a one-binome pirate in charge of the steering wheel of Mare who wears an eyepatch.

Mr. Jimmy

Mr. Jimmy is a zero-binome who is in charge of the ship's prison.

Mr. Mitchell

Mr. Mitchell is a wealthy one-binome.

Mouse (voiced by Louise Vallance) is a hacker who wields a katana and another, smaller sword, and has a high-tech craft called Ship. She first appears on-screen in "The Great Brain Robbery", where she is hired as a mercenary by Megabyte. However, she turns against him when it became obvious she had been double-crossed and was endangering a young child. She later returned in Season 2 to save Bob and Dot from Gigabyte and became part of the main cast from then on. She had been hired by the Guardians to discover if there was a Web Creature in Mainframe; during the subsequent Web War and Viral Wars, Mouse's hacking skills became a major asset in thwarting Mainframe's enemies, including developing a complex Firewall that Daemon could not get through, and was blocked from multiple Systems. Due to her invaluable assistance, Mouse is allowed to upgrade her icon and AndrAIa's to a full Mainframe icon. At some point between the episodes "End Prog" and "Daemon Rising", Mouse begins dating Ray Tracer.

Her name is a reference to the computer mouse.

Sir Algernon Cholmondley-Worthington III and Binky Ffarquarson, also known as the British Binomes, appear in several episodes. They act as pilots and are very stereotypically British, using phrases such as "steady on", "jolly good", "fancy a biscuit" and "I'll put a brew on".

Cyrus is a one-binome who worked for Megabyte of his own free will without having been infected. In Season 1, he was helping Dot rescue and reformat a Sector to free it from Megabyte, but defected for mercenary reasons and helped Megabyte attempt to steal the PIDs in the Sectors so that they could be infected. However, Cyrus was infected and turned into Megabyte's boot-shiner. In Season 3, he was put in charge of a propaganda campaign against Enzo's ability to act as guardian, designed to demoralize Enzo and the general population. However, when he and Enzo ended up in a game, Cyrus was forced to help defeat the User; when he discovered that Enzo wanted his help and trusted him despite all he had done, he not only helped, but also saved Enzo's life.

Codemaster Lens is a Net-born member of the Codemasters, one of the most feared and dangerous sects in cyberspace. Lens had a distinct code of honor, barely spoke to other characters, and was described as a terrifying hunter by Phong. Using his Gibson-Coil pike, he can teleport, knock over buildings, wield energy bludgeons, and imprison Bob's Keytool, Glitch, behind a force field. Lens refers to himself as belonging to "The Sixty-Second Brotherhood", and by the titles "the Reaper" and "the Clear Unfolding".

AndrAIa (voiced by Andrea Libman as a child and by Sharon Alexander as an adult) is a backup copy of a Game Sprite who met Enzo in an undersea-themed game and fell in love with him at "first sight." The original AndrAIa piggy-backed her icon on Enzo's, allowing the backup to escape the game and stay in Mainframe with Enzo while the original remained in the game. Her name is pronounced like "Andrea".

Because of the nature of the game from which she was born, AndrAIa has many mermaid-like qualities: she wears fish-skin garments, wears starfish in her hair which can be used like a shuriken with boomerang qualities, and utilizes such armaments as paralysis-inducing fingernails and a trident in combat.

Andr often serves as a voice of reason and, despite Matrix's jealousy, befriends the newcomer Ray Tracer, whom assists them in entering the WEB. Before entering the dimension, however, AndrAIa is bitten by a Web creature that steals her energy and part of her code. For the majority of their trip in the Web, she remains in a comatose state while the others fought against the environment in search of Bob and the creature that bit her. Bob finds them and heals AndrAIa with the recovered code and energy.

Gigabyte (voiced by Blu Mankuma) is a Class-5 (energy absorbing), malignant and powerful super-virus, who is the upgraded form of Killabyte. A signal from Welman Matrix's experimental gateway accidentally locked onto Gigabyte and brought him to Mainframe. The gateway overloaded and Mainframe's twin city was destroyed in the explosion, becoming Lost Angles. Gigabyte was separated into Megabyte and Hexadecimal, making the siblings effectively opposite parts of the same whole; Megabyte representing order and Hexadecimal representing chaos.

Gigabyte is briefly reformed in Season 2, when Megabyte, possessed by a Web Creature, fuses with Hexadecimal. However, Hexadecimal's power had been drained at the time and Gigabyte is left weakened and forced to feed off the energy of individual Sprites. Mainframe is powered down to keep him from gaining power and the System's defenders, helped by the newly returned Mouse, attempted to keep him contained. Bob traps Gigabyte inside a Tear and uses its energy to split Gigabyte once again.

His name comes from gigabyte, a unit of computer memory, measuring approximately one billion bytes (1,024 megabytes).

Fax Modem and Data Nully are CGI special agents. They are one-binomes modelled on Fox Mulder and Dana Scully from The X-Files. Gillian Anderson, who portrayed Scully, also voiced Nully. Modem believes there is no User and that the Guardians drop Games on Systems to promote the User myth.

Turbo is Prime Guardian and leader of the Guardian Collective. He is equipped with a Guardian Keytool, Copland, which can transform into any device with a voice command. He speaks with a Texan accent.

Turbo is forced to order the destruction of Mainframe after a Web Creature arrived in the system, but regrets the decision due to his friendship with Bob and secretly increases the countdown on the bomb he had hidden with Mouse. Although Bob gets rid of the bomb, Turbo is considered by many to be an enemy afterwards. When Matrix encounters Turbo in a distant system, he is searching for Bob, the only Guardian known to not be infected by Daemon. Turbo informs Matrix of the Daemon threat, as well as the necessity of finding Bob. As he can still fight the infection, Turbo promises to work against Daemon from inside the Guardian Collective. By the time they next meet, Turbo had succumbed to Daemon's infection, causing Copland to leave Turbo on his orders. After being partially cured by Bob's incomplete Guardian code, Turbo provided valuable information which helped Mainframe fight back against the super-virus. After Daemon's defeat, Turbo returns to his position as Prime Guardian.

The Class-M Webcreature is an entity who was sent by Daemon and is attracted to viruses. Its first act upon reaching Mainframe is to attack and bond with Hexadecimal, causing the System's nulls to swarm over her in an attempt to keep the Webcreature from the rest of Mainframe. After Hexadecimal's powers were drained by the nulls, the creature escapes and bonds with Megabyte. In both cases, the resulting symbiote is highly animalistic and under the control of the Webcreature. The Webcreature gradually becomes a fanged creature who needs to drain energy from others to remain stable outside of the Web.

The Web Spores are an alien army that invades Mainframe through the Class M's Web-Portal. They show a hive mentality and a sense of cooperative strategy, overrunning Systems in vast numbers.

Powerlock is a large, muscular, gun-toting virus. He was downloaded into an isolated System populated by energy beings called Spectrals. He was openly a member of the Hero Selective, the System's Sprite defenders against Games, and kept his viral nature hidden while he tried to cause System crashes. His true nature was discovered by Matrix and he was deleted. He had an unnamed partner, a Viral Spectral.

Ray Tracer is a "second generation" Web search engine who is immortal, as he and his board are the same entity. When he and his board are separated, any damage to his board is reflected on his person in the nature of the lights that circulate on his body shorting out. During Season 4 and beyond, he is romantically involved with Mouse.

An adrenaline junkie, Ray longs for adventure and loves the danger of exploring the Web. After he is captured by the Guardians for unauthorized Net travel, he is rescued by a reluctant Matrix. After saving AndrAIa from a fleet of CPUs, he joins the crew of the Saucy Mare in searching for Bob in the Web, acting as their guide. Matrix is initially angered by his presence due to his seeming attraction for AndrAIa, but grows to respect him after he risks his life to repair AndrAIa's damaged code.

Ray was separated from the others when they neared the portal to Mainframe, but returned to Mainframe through the same portal Megabyte was sent through and remained to help the citizens evacuate into the Principal Office when the system was close to crashing. After the restart, during the war against Daemon, Turbo claimed to Mouse that Ray had been infected. After Daemon's defeat, Ray returned to Mainframe with the pre-season 3 Bob, unaware that he was Megabyte in disguise. Through Season 4, Ray appears in a minor, nonspeaking role.

Webcreatures that resemble Hammerhead sharks with a vertical head and no eyes. They can drain energy from sprites and are born from ball-shaped eggs connected by vein-like tubes. Newborns have no armour and sleek skin, while older Webcreatures have a carapace-like hide that can withstand punishment. Their teeth can chew through many substances, including sprites and metal. They are capable of growing to a gargantuan size, roughly the size of a ship. Its bones are used to cover the Captain's ship as an armature for the other carapace pieces.

Sprites that have survived the web and became deformed while no longer requiring sustenance from energy foods. Newer sprites keep their original appearance, while older ones start resembling Webcreatures; in the case of Bob after his exile by Megabyte, his hair changed into a wave-pattern, silver scales began to grow on his face, and his uniform began melting into his skin. One of the elder sprites only has one hand, a vaguely peg leg, and a face resembling the M-class Webcreature. While these sprites do not speak normally, they communicate through what appears to be dial-up modem clicks. While not technically viruses, they have proven to be quite hostile in nature.

Daemon (voiced by Colombe Demers)^[5] is a super-virus bent on infecting the entire Net, succeeding in infecting the entire Guardian Collective, with the exception of Bob and Matrix, and turning the Super Computer into her base of operations. She is religiously worshiped by those she infects, and known to them as "The Word" and addressed as "My Lady".

Daemon claims to strive for peace and unity in the Net and is different from other viruses in that she does not seem to believe that what she is doing is wrong, seeing herself as a messiah trying to "save" the Net. She speaks in a French accent and calls Mike the TV "Michel", and is depicted in the style of Joan of Arc, a petite female holy warrior. Though evil, she has a gentle and benign personality. However, despite her seeming benevolence, her infection turns people peaceful at the cost of their free will, to the point where they are willing to die to carry out her will.

Daemon later reveals that The Word is "Cron", and Bob realizes that she is a "cron virus": an "end to all things" virus.

Daecon is Daemon's main advisor and assistant, under the influence of The Word. His name and character follow Daemon's religious motif. He kills himself after failing Daemon's order to penetrate Mainframe.

Dixon Green was Bob's partner when he was in the Guardian Academy as a cadet. She was Glitch's original owner, and had a flippant and single-minded personality. Her name is taken from the British TV show Dixon of Dock Green. Dixon is deleted due to damage inflicted by Killabyte as he was being upgraded to Gigabyte.

Killabyte is a virus that was captured and set to be deleted by Guardian Dixon Green. Before he could be destroyed, Killabyte received a user upgrade and escaped. Killabyte intended to kill Bob, but transformed into Gigabyte and was pulled from the Super Computer to Mainframe before he could do so.

His name comes from kilobyte, a unit of computer memory.

Welman Matrix is a scientific genius and father of Dot and Enzo Matrix. He designed a gateway device that would have allowed Mainframers to connect to outside Systems, sending a series of pings into the Net to locate and contact Systems and then link to them. However, Welman's experiment backfired due to his gateway pinging Killabyte and warping him into Mainframe as Gigabyte. The resulting explosion nullified Welman, split Gigabyte into the entities Hexadecimal and Megabyte, and destroyed Mainframe's sister city, with the ruins becoming known as Lost Angles. As a null, he was adopted as Nibbles by Megabyte, who apparently knew his true identity.

In Season 4, Hexadecimal's powers over nulls allowed him to regain his sentient mind and mold with other nulls to form a body. While catching up with his family, the young Enzo was found to have adapted to his father's transformation quite well as Phong informed Welman of Matrix being his son.

Since Welman's ability to assert his personality is directly connected to Hexadecimal's well-being, she imbued young Enzo's icon with the same function before sacrificing herself to undo Daemon's Net-wide infection. When Enzo came into contact with him, Welman regained his sentient mind once more and became able to move around by controlling a "Null-Bot", which he used to walk his daughter Dot down the aisle at her wedding. His robotic body is later infected by Megabyte at the end of season 4 and used to capture the young Enzo as everyone is forced to flee to the catacombs after Megabyte infiltrates the Principal Office. In Code Of Honor, he is initially enslaved to Megabyte and goes missing after he is destroyed.