Voir Dexter's Laboratory: The Complete Series - Episode 12

"Dexter's Rival" The new kid in school, Mandark, steals Dexter's spotlight and his ego when he finds Mandark has a bigger and better laboratory. Dexter triumphs when he helps Mandark invite Dee Dee, the most destructive force known to any lab, over for a date. "Bee Where?" (Justice Friends) When there's a bee on the loose in the Justice Friends' apartment, Major Glory, Valhallen, and Krunk freak out. Through Operation Sting and the Justice Frenzy, they manage to destroy their abode, but not the bee. "Mandarker" An overconfident Dexter, who has won the last three Battle of the Science Projects, underestimates Mandark's genius when this year's contest is announced. Dexter is awarded first place, but then late entrant Mandark reveals his project, JoJo, and the judges reconsider.