Charlie Hoge
Joel
Michael Rand
Mario Castelnuovo-Tedesco
Priest James
Edwards
Uncle
Dr. Roberts
Mr. Milk
Artemis
Phillip
Mr. Ellis
Forrest Bobo
Dr. Kirk Langstrom (voice)
Frank Devore
Chick
Dr. Thomas Casey
Uncle Jeff
Kenneth
Dr. Lansen
Peter
Lieutenant Durgan
Detective Carter
Sergeant Mallory
McMahon
Detective Vic Gigante
Harry
Mr. Frost
Captain Atom (voice)
Aldrich De La Chasse
King
Sonny
Sid Harris
Stuart St John
Judge Moran
Railroad Foreman
Uncle Doug
Peter Shepherd
Gus
Admiral Kentz
Harkness
Arlen Pavich
Jonathan
Tommy Tulip
Joey Patterson
Mr. DeMarco
Virgil Koster
Dakar Johnston
Nathan Van Cleef
Evan Wantz
Dr. Dylan Cotner
Bo Tyler
Yepihodov
Gavreau
Lt. Clyde Webber
J.D. Johnson
Hammond
Dr. Lamar
Secret Service Agent Gibbs
Buzz Aldrin
Date #4 (uncredited)
John Barrows
Gentry
Lonner (uncredited)
Alexander Willis
Sunburned Man
Donald Falk
Ralph
Cynical Cabbie
Henry Hurt
Greg White
Shakespeare
Sherman Carson
Joey Szabo
Second Man
Russ Loring
Capt. Whitaker
Kozolowski
Trevor Lyle
Peter Zenner
Harold
Roberts, Vietnam
Harvey Preston
Todd Voight
Bruce MacNamara
Harry Copeland
Lt. Pierson
Stark
Detective
Fast Eddie
John Patrick Earl
Monty Griswold
Blackwell
Rudy Mohr
Waingro
Jack Torme
Ricky Fell
Cardogan
Ez Andy
Byron Cole
Preacher McMahon
Yo-Yo
Bowery Snax
Kent Sutcliffe
Connally
Christopher Crawford (Adult)