Ooblar was the self-appointed "checker of new things to be checked" on the planet Yolkus. He is the brother of King Goobot. The character no longer serves as King Goobot's assistant since he was traded for butter.
Ooblar has only appeared in several episodes of The Adventures of Jimmy Neutron: Boy Genius. His first appearance was in Runaway Rocketboy!. His last appearance was in The Eggpire Strikes Back, but was mentioned later in The League of Villains.