My Stepmother Is an Alien

Dan Aykroyd

Steven Mills

Kim Basinger

Celeste Martin

Jon Lovitz

Ron Mills

Alyson Hannigan

Jessie Mills

Joseph Maher

Lucas Budlong

Seth Green

Fred Glass

Ann Prentiss

The Voice of the Bag (voice)

Wesley Mann

Grady

Tony Jay

Council Chief

Peter Bromilow

Second in Command

Nina Henderson

Cashier

Harry Shearer

Carl Sagan (voice)

Adrian Sparks

Dr. Morosini

Juliette Lewis

Lexie

Tanya Fenmore

Ellen