Jeepers, Creepers, Where Is Peepers is the first part of the 12th episode of season 3, which aired on July 12, 2002. In this episode, Peepers, the king of Koosland, is kidnapped, and as a result, the place is getting destroyed. Dexter and Koosy go and save him.
Dee Dee and Koosy are playing catch with a ball in Koosland laughing and having loads of fun and Koosy's pet dog Peepers is on the picnic blanket by them. He tells them to shut up and they think he's being a grouch. He tells them that he can't sleep with them playing. Peepers sleeps some and a mysterious figure takes him away. Then Koosland starts falling apart and a huge storm of evil forms over the skies. Dee Dee asks what's going on and Koosy tells her the story. He says that Koosland was created back when Dee Dee was just a dumb little baby and she made Peepers he the person who holds Koosland together and now that he's gone Koosland is doomed and they must get him back.
Dee Dee has the idea to turn to Dexter and ask for his help but automatically Dexter isn't allowing it. Koosy gets ahold of the Robo-Dexo and goes off to Koosland, but before he can go through the portal Dexter chases after and quickly goes in there with him to get his robot back leaving Dee Dee behind. When Dexter gets into Koosland, Koosy convinces him to help them save Koosland. When he does they use the Robo-Dexo to fly through space and find where Peepers is. They have to fight some robot troops and when they find where he is, they find themselves in an evil space lair with an evil anime mastermind named Hookocho the Prince of Pain and Destruction. He is holding Peepers captive inside of his lair and Dexter and Koosy attempt to fight Hokokchu to set Peepers free but fail. When Hokokchu is just about to destroy Dexter and Koosy, Peepers turns into a giant monster and destroys Hokokchu. They return Peepers to normal and all end off the story happily ever after with Koosy's theme song he made up for him and Dexter.