Alien Planet

Wayne D. Barlowe

— Self

Curtis Clark

— Self

James Garvin

— Self

Jamie Haines

— Self

Stephen Hawking

— Self

Jack Horner

— Self

Joan Horvath

— Self

Michio Kaku

— Self

George Lucas

— Self

John C. McGinley

— Narrator

Victoria Meadows

— Self

David Moriarty

— Self

Randy Pollock

— Self

J. Craig Venter

— Self

James Kirkland

— Self