Diplodocus is a curious little dinosaur who dreams of a big adventure. Unfortunately, he lives in a boring prehistoric swamp that is surrounded by a high wall. What Diplodocus doesn't yet know is that he's actually a character in a comic book created by artist Ted. When his publisher convinces him to get rid of the old-fashioned plots, Ted puts an eraser to paper and begins erasing the jungle... and Diplodocus' home. In an attempt to escape mortal danger, the dinosaur jumps out of the comic book and embarks on an amazing journey through magical worlds.