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Rex Robot is a minor antagonist in The Backyardigans.

Personality

Rex Robot is evil, intimidating, and ruthlessly loyal to his master, Professor Bug, and stops at nothing to fulfill his master's wishes.

Looks

Rex Robot is extremely different from the robots in Mega City. He is much bigger and taller, has a black paint job, a blood-red color scheme, bright red eyes, and a grave low pitch voice.

Appearances

Rex Robot has appeared in one episode of The Backyardigans: "Robot Rampage: Part 2" from season four.

Characters
Main characters
UniquaPabloTyroneTashaAustin
Recurring characters
WormansShermanDragonRobot RoscoeCan't-See-UmsFishGiant ClamGiant RobotBoyAnnouncer
Minor characters
AliensAsian ElephantAustin's CatBirdsBlargBlue StreakBoingaBugsBullButterflyClementineCommon HouseflyDinosaurDinosaur SkeletonDustyElephantsFactory RobotsFlapasaurusGilded Golden ButterflyGrabbing TreeHarveyHermanHorsesHugsLightningMale HippoManchester UnitedMaverickMega City RobotsMia HammMolassesMommy MartianNot-So-Nice DragonOld PaintPablo's MotherPainted HorsesPalPeléPolka-Dot DonkeysPolka-Dotted PonyPrincessPrincess CleoTasha's HorseQuick SilverRalphyRex RobotRobot RacquelRobot RebaRobot RipleyROVERRoyal HorsesSanta ClausSea SquirtSea MonsterSeatriscuitSharksShooting StarSpacemanSpooky VoiceThunderToronadoTropical FishTyrone's FatherTyrone's MotherUniqua's MotherViewerWindyW-I-O-Wa News Announcer
Characters from merchandise
ButterfliesFirefliesFrogJellyfishLadybugOctopusesSlug
Characters from live performances
Boinga-BoingaClammyDoll and FinnEspejo MágicoMarshaOctaviaSeahorse
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