The Atomic Kid

Mickey Rooney

— Barnaby 'Blix' Waterberry

Robert Strauss

— Stan Cooper

Elaine Devry

— Audrey Nelson

Bill Goodwin

— Dr. Rodell

Whit Bissell

— Dr. Edgar Pangborn

Joey Forman

— MP in Hospital

Peter Leeds

— Agent Bill

Hal March

— Agent Ray

Fay Roope

— Gen. Lawlor

Stanley Adams

— Wildcat Hooper

Robert Emmett Keane

— Mr. Reynolds

Paul Dubov

— Anderson

Bill Welsh

— Commentator