Robert Vaughn

as Napoleon Solo

David McCallum

as Illya Kuryakin

Barry Sullivan

as Dr. Robert Kingsley

Eleanor Parker

as Margitta Kingsley

Leslie Nielsen

as General Maximilian Harmon

Leo G. Carroll

as Alexander Waverly

Tony Bill

as Steven Garrow

Peter Mark Richman

as Mr. Webb

Albert Paulsen

as Dr. Kurt Erikson

Inger Stratton

as Anna Erikson

Hugh Marlowe

as Grant

Amy Thomson

as Miss Carla

Dan O'Herlihy

as Prof. David Garrow

Ruth Warrick

as Alice Garrow

David Hurst

as Dr. Jan Vanovech

Barbara Moore

as Lisa Rogers

Arthur Hanson

as Paul Mackie

Richard Bull

as Capt. Gelser

Edgar Stehli

as Veeth

Annella Bassett

as Dr. Naomi Fisher

Logan Ramsey

as Ship's Captain

Guy Lee

as Cab Driver

Ray Weaver

as Reporter

Michael Masters

as Reporter