Arnold Stang as Pretzie

Arnold Schwarzenegger as Hercules

Deborah Loomis as Helen Camden

James Karen as Professor Camden

Ernest Graves as Zeus

Tanny McDonald as Juno

Harold Burstein as Rod Nelson

Merwin Goldsmith as Maxie

George Bartenieff as Nitro

Taina Elg as Nemesis

Michael Lipton as Pluto

Jan Adams as

William Bass as

Rudy Bond as Ship Captain

Lane Carroll as

Tony Carroll as Monstro

Oliver Clark as

Erica Fitz as Venus

Erin Fleming as

Frank Gio as

Diane Goble as Diana

Dan Hamilton as Mercury

Richard Herd as Television Presenter

Audrie Magee as

Michael Miller as

Ronnie Richards as

Tony Roland as

Alex Stevens as

Viola Swayne as

Mark Tendler as Samson

Dennis Tinerino as Atlas

Alicia Vetcher as

Iris Whitney as

Parnell Hall as Man with Chariot (uncredited)

Abe Holiday as Scared Man on Harbor (uncredited)

Sam Stewart as Bear (uncredited)