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Real Identity: Mikron O'Jeneus
Affiliations: H.I.V.E.
Appearances: Laundry Day, Super Robin, Artful Dodgers, The Left Leg, Power Moves, No Power, Sidekick, Legs, Breakfast Cheese, Opposites, In and Out, Money Grandma, Road Trip, Mouth Hole, Real Boy Adventures, Let's Get Serious, Multiple Trick Pony, Yearbook Madness, Operation Tin Man, The H.I.V.E. Five, Some of Their Parts, I'm The Sauce, Hey You, Don't Neglect Me in Your Memory, Scary Figure Dance, Animals: It's Just a Word!, The True Meaning of Christmas, Garage Sale (memory), How 'Bout Some Effort, Wally T, The Titans Show, Snuggle Time, The Streak: Pt 1, Costume Contest, and The Scoop!
Powers/Skills: Genius and Engineering
Voiced By: Lauren Tom

Gizmo is a boy genius who uses his intellect for evil and seeks to take over the world with his inventions. He is 3'2'' and 55 pounds. Gizmo once raised an army of giant robots and flew to Titans Tower. However, he found a naked Robin and decided to belay his plans for world domination then abruptly left. Gizmo is also the leader of the H.I.V.E. supervillain team. Gizmo participated in a H.I.V.E. plot to rob the Jump City Bank. However, he was blown out of sky by Cyborg with one missile. Gizmo later attempted to conquer Jump City once again with his robot army. This time, he was opposed by the Titan Robot, operated by the Teen Titans. Robin broke through the army with upgrades he added to the left leg. While the other Titans tried to stop Robin from overwhelming the robot, Gizmo attacked. Robin detached and drop kicked Gizmo's robot into submission.

For one Valentine's Day, Jinx and Cyborg pretended to be married and that Gizmo was their baby son. Gizmo naturally objected to the farce and demanded to be let go. For most of the day, they pacified him by sticking a bottle of milk in his mouth. After Jinx was upset by Cyborg's gift, she changed Gizmo's diaper to his displeasure. But as soon as they put a new diaper on, he was content and fell asleep. Once Cyborg left for the Land of Last Minute Valentine's Gifts, Beast Boy combated Gizmo's "fussiness" by swaddling him. It was so tight, Gizmo became cozy and fell asleep. Once Valentine's Day came to an official end at midnight, Cyborg and Jinx were okay again. Everyone left Gizmo in the living room of the Titans Tower in need of a diaper change.

Gizmo and his robot army rampaged on the city again. This time, the Teen Titans brought their number one fan, Wally T, with them. Empowered by fan strength, the Titans easily defeated the army. Beast Boy transformed into a dinosaur and bashed Gizmo's robot to pieces. Somehow, Gizmo quickly returned with his army and stomped the Titans, who had lost their one fan after too much pandering. Wally T, covered in a golden aura, floating down from the sky and empowered the Titans once more. They unleashed a focused blast and decimated Gizmo's army. Gizmo rampaged in his robot at the start of Crime Season. Beast Boy changed into a rhino and rammed the robot, getting the Titans' first win.