Jessica D. Stone

as Stanley (voice)

Charles Shaughnessy

as Dennis (voice)

Ari Meyers

as Mom (voice)

Hynden Walch

as Elsie (voice)

Khylan Jones

as Mimi / Marci (voice)

Hillary B. Smith

as Paleontologist (voice)

Randy Quaid

as Rockin' Rory (voice)

John Ritter

as Great Uncle Stew (voice)

David Landsberg

Shawn Pyfrom

Philece Sampler

Daniel Franklin Hatch