Glenn Manning, "The Amazing Colossal Man," believed dead after falling from the Hoover Dam, reemerges in rural Mexico, brain damaged, disfigured, and very angry.

Sally Fraser
as Joyce Manning

Roger Pace
as Major Mark Baird

Duncan 'Dean' Parkin
as Col. Glenn Manning

Russ Bender
as Dr. Carmichael

Rico Alaniz
as Sgt. Luis Murillo

George Becwar
as John Swanson, truck owner

Roberto Hernández
as Miguel

Charles Stewart
as Capt. Harris

June Jocelyn
as Mrs. Edwards, mother

John McNamara
as The Neurologist