Cartoon Rocket is a show created by Kikyo that only ran for four episodes.
The story is about Kali and Julian, creative siblings who build "rockets" to fly to different planets, collecting characters from their favorite shows. In truth, this was their imagination. The title screen showed them using spare stuff from their yard to turn their swing set into a rocket, then it turning to a slightly more cartoonish view, showing the kids boarding a real rocket.
The show was released in 2004, but wasn't popularly liked. However, Julius found interest in it, working with Kikyo to later create Cartoon House.