Ray Danton

John Conrad, alias Johnny Salvo

Leigh Snowden

Maria Craven

Grant Williams

Don Kastner

Onslow Stevens

Chief Agent Alec Conrad

Raymond Bailey

Philip Bormann

Judson Pratt

Agent Maury Saxton

Jack Kruschen

Agent Pill Schwartz

Floyd Simmons

Agent Harris

Mel Welles

Milo

Alexander Campbell

Warden Lewis

Kaaren Verne

Mrs. Pulenski (as Karen Verne)

Maurice Doner

Mr. Pulenski

Jess Kirkpatrick

Bill MacReady

Arthur Hanson

Agent Parker

Richard H. Cutting

Agent Pomeroy

Jack Arnold