What happened to all these good kid shows?
This theory is quite similar to the famous Pixar Theory. This theory posits that all the Cartoon Network shows may be connected somehow, and it obviously begins in the Stone Age.
When Bedrock invents the tech seen in Dexter's Laboratory, it creates a Shadow Demon named Aku.
Worried about the future, Gaia transforms Fred into Samurai Jack, giving him the mission to save the earth from these creatures that threaten the future of earth. During this battle, 3 village girls invent imaginary friends with mythical powers. Shortly after, the girls become corrupted.