Jimmy Neutron is the smartest kid in town. As a genius, Jimmy thinks most things can be solved with the invention of a new gizmo. But Jimmy usually takes the easy way out, and his backfiring gadgets result in comedic adventures.
A group of kids join a secret agency where they learn to use the power of imagination to journey into the Dream World and create fantastic creations in order to help sleeping children being terrorized by the evil Nightmare King who is bent on conquering the Dream World and invading the Waking World.
Koko, Brewster and Wilson are three young, adventurous trainee "chuggers", learning about working on the railway in the town of Chuggington, with the help of the railway controller, Vee, the older engines, and their human friends.
A teenager named Tom, whose friend Kaz constantly tells him of his adventures in Chaotic. Tom, who believes that Chaotic is only a card game, thinks that Kaz is making things up, until he entered a password he received from the game, transporting him to the world of Chaotic.
Casper is a friendly ghost--the friendliest ghost you know! Unfortunately he lives with his three Hauntaholic uncles: Uncle Stretch, who's convinced he's smarter than anyone who ever died; Stinkie, who can put down any fleshie with one belch-blast; and Fatso, who's big, round and not too bright. Trying to cure these brothers is Dr. James Harvey and his spunky and worldly daughter Kat. Put them all under one roof and you have a house full of fun.