Tim Allen

Jason Nesmith

Acting

Sigourney Weaver

Gwen DeMarco

Acting

Alan Rickman

Alexander Dane

Acting

Tony Shalhoub

Fred Kwan

Acting

Sam Rockwell

Guy Fleegman

Acting

Daryl Mitchell

Tommy Webber

Acting

Enrico Colantoni

Mathesar

Acting

Robin Sachs

Sarris

Acting

Jed Rees

Teb

Acting

Justin Long

Brandon

Acting

Missi Pyle

Laliari

Acting

Patrick Breen

Quellek

Acting

Jeremy Howard

Kyle

Acting

Sam Lloyd

Neru

Acting

Rainn Wilson

Lahnk

Acting

J.P. Manoux

Excited Alien

Acting

Dian Bachar

Nervous Tech

Acting

Heidi Swedberg

Brandon's Mom

Acting

Kevin McDonald

Announcer (as Kevin Hamilton McDonald)

Acting

Kaitlin Cullum

Katelyn

Acting

Jonathan Feyer

Hollister

Acting

Corbin Bleu

Young Tommy

Acting

Isaac C. Singleton, Jr.

Sarris' Guard

Acting

Joel McKinnon Miller

Warrior Alien

Acting

Todd Giebenhain

Teen in the Bathroom #2

Acting

Jerry Penacoli

Reporter

Acting

Jennifer Manley

Shy Girl

Acting

Matt Winston

Technician #1

Acting

Morgan Rusler

Fan #2

Acting