Unsuccessful scientists, Ed, Edd n Eddy, try to create attractions for their science fiction theme park. They try to test their Monster-matic on Ed only to discover Ed has also gained primal instincts.
Ed/Edzilla- Loves science fiction, and always wanted to be a monster, Double Dee and Eddy change him into one with the Monster-matic, but goes out of control.
Edd (Double Dee)- The only one among the Eds who has a masters degree.
Eddy- Always tries to exploit the Eds inventions for his own financial gain.
Jonny and Plank- A local construction worker and his imaginary friend.
Jimmy- Next-door neighbor of the Eds and Sarah's boyfriend.
Sarah- Ed's younger sister, the Eds live in her basement.
Kevin- The mayor of Culdesac-opolis.
Rolf- An ambassador from an unknown country.
Nazz- A tv reporter.