Here's how it works. You'll be competing with those alien species in various challenges. The winner gets a brand new car. The loser gets their home planet destroyed!
~ Meldar explaining the game show.
Poor clueless lifeforms! Don't you get it?! I can bend space, twist time, warp reality, like this!
~ Meldar to everyone
It's time I've sent you to commercial... permanently.
~ Meldar to Jimmy

Meldar Prime is the main antagonist of the Jimmy Neutron movie-episode "Win, Lose and Kaboom". He was voiced by Tim Allen, who voiced Buzz Lightyear in the Toy Story movies.

He consists of an organic head attached to a robotic body and is the host of a game show called "Intergalactic Showdown" in which aliens from different planets have to compete against each other in several challenges, and all but the winners have their home planets blown up. Meldar does all this using his matrix generators, which give him virtually limitless reality-altering powers and prevent inhabitants of the galaxy from stopping him.

He casually treats this mass genocide, which he seems to have no motive for other than entertaining himself, like an ordinary game show, making jokes out of blowing up planets, and April says that he has been doing so for "eons". At the end of the episode, Jimmy and friends manage to steal Meldar's matrix generators and destroy them, ending his show once and for all and leaving him to be tortured forever with electricity by the Brains (one of the other races they were competing with on the show).