Captain America / Steve Rogers

Reb Brown

Lou Brackett

Steve Forrest

Dr. Simon Mills

Len Birman

Dr. Wendy Day

Heather Menzies

Tina Hayden

Robin Mattson

Rudy Sandrini

Joseph Ruskin

Charles Barber

Frank Marth

Ortho (uncredited)

Michael McManus

Harley

Lance LeGault

Mrs. Shaw

Susan French

Jerry

Chip Johnson

The Young Boy

Alex Hyde-White

Lester Wiant

James Ingersoll

Miguel

Christopher Lee

F.B.I. Assistant

Jim B. Smith

Doctor

Arthur Rosenberg

2nd Doctor

Jason Wingreen

Connie Sellecca

Secretary

June Dayton

Yolanda

Lana Wood

Nurse

Diana Webster

Jeff Hayden

Dan Barton

1st Doctor

Ken Chandler

Anesthetist

Buster Jones

Throckmorton (uncredited)

Nocana Aranda

Wino in Park (uncredited)

Lonnie Pense

Helicopter Pilot (uncredited)

Charles A. Tamburro