Screamer

Libby Folfax

Ultra Lord

King Goobot

Nick Dean

Zachery

Ooblar

Goddard

Sheen Estevez

Little Girl

Carl Wheezer

Chris

Poultra

Yokian Incubator Operator

Guard

Judy Neutron

Cindy Vortex

Bobby

Ms. Fowl

Norad Officer

Jimmy Neutron

Octapuke Kid

Hyperactive Kid

Gus

Sheen's Dad

Hugh Neutron