Reb Brown as Captain America / Steve Rogers

Connie Sellecca as Dr. Wendy Day

Len Birman as Dr. Simon Mills

Christopher Lee as Miguel

Katherine Justice as Helen Moore

Christopher Cary as Prof. Ian Ilson

William Lucking as Stader

Stanley Kamel as Kramer

Ken Swofford as Everett Bliss

Lana Wood as Yolanda

Arthur Rosenberg as Doctor

William Mims as Dr. J. Brenner

Alex Hyde-White as Young Man

Lachelle Chamberlain as Young Girl

Susan French as Mrs. Shaw

John Waldon as Peter Moore

David S. Cass Sr. as Milt (uncredited)

Bud Davis as Les (uncredited)

Timothy O'Hagan as Cal (uncredited)