Reb Brown

Character: Captain America / Steve Rogers

Connie Sellecca

Character: Dr. Wendy Day

Len Birman

Character: Dr. Simon Mills

Christopher Lee

Character: Miguel

Katherine Justice

Character: Helen Moore

Christopher Cary

Character: Prof. Ian Ilson

William Lucking

Character: Stader

Stanley Kamel

Character: Kramer

Ken Swofford

Character: Everett Bliss

Lana Wood

Character: Yolanda

Arthur Rosenberg

Character: Doctor

William Mims

Character: Dr. J. Brenner

Alex Hyde-White

Character: Young Man

Lachelle Chamberlain

Character: Young Girl

Susan French

Character: Mrs. Shaw

John Waldon

Character: Peter Moore

David S. Cass Sr.

Character: Milt (uncredited)

Bud Davis

Character: Les (uncredited)

Timothy O'Hagan

Character: Cal (uncredited)