Myron Natwick as Dr. Frederick Klaus

Brian Knudson as Victor Hunter

Mary Louise Gemmill as Sandra Jensen

Christopher Cho as Dr. Lee Fong

Paula Randol-Smith as Heidi

John-Scott Taylor as Dr. Paul Holt

Christopher Wolf as Tom (as Chris Wolf)

Oliver Leymarie as Eddie

Kelvin Tsao as Hopper

Ray Essler as Louis

Bob Rudd as Agent / Radio Voiceover

Chris DeCanette as Agent

Leroy Jones as Priest

Betsy Ferguson as Dorothy

Beatrice Dickson as Ripley

Carolyn Wang as Ms. Edokko

Jerry West as Jesus Freak

Scott Blackwood as Couple on Beach

Daryl Shannon as Couple on Beach

Mike McFarland as Mickey

Nancy Gaines as Mickey's Girlfriend

Steve Hardy as Alpha Interns

Geir Ness as Alpha Interns

Gary Nadeau as Policemen

Mark Murphy as Policemen

Ed You as Foster

Forrest Patrick as Norm

Steve Neale as Motorcycle Messenger

Gregory P. Alcus as Charlie (as Gregory Alcus)

Kris Burcham as Foster's Wife

Connie Singer as Vickie

Kim Robert Koscki as Man Changing Tire (as Kim Koscki)

Conrad Hurtt as Man in Motel (as Conrad Hurt)

Elisa Monroe as Beach Girl

Bronwyn St. John as Beach Girl

Chuck Ward as Man in Car (as Charles Ward)

Pat Casiano as Praying Woman (as Pat Casiano)

George Casiano Jr. as Child