Baljeet Tjinder is a character from the Disney Channel TV show, Phineas and Ferb. He is good friends with Phineas and Ferb. He is sometimes with Buford, and Phineas and Ferb help him out.
In the Episode "Cranius Maximus" when Baljeet becomes concerned that he is losing his mental edge, the boys invent a cerebral stimulatory hat, or "Brain booster," to help him. But when the hat exceeds expectations and makes Baljeet exponentially smarter, he suddenly views everyone else as beneath him and becomes a threat to civilization by taking Earth's atmosphere and bringing it to the moon.