Jimmy Neutron/Superbook

Jimmy Neutron as Chris Quantum

Cindy Vortex as Joy Pepper

Carl Whezzer as Gizmo

Midgel (from 3-2-1 Penguins!) as David

Kevin (from 3-2-1 Penguins!) as Goliath

Zidgel (from 3-2-1 Penguins!) as Eliab

Tommy and Chuckie (from Rugrats) as the Tell-a-Liers

Cavitus (from 3-2-1 Penguins!) as King Saul

Professor Wordsworth (from 3-2-1 Penguins!) as Phicol

Saul (from 3-2-1 Penguins!) as Samuel

Stu Pickles (from Rugrats) as Jesse