Richard Dysart

as Self (archive footage)

as The Ancient Mariner (voice)

as Leland McKenzie

as Cogliostro

as Henry Sears

as Nicholas Cogliostro (voice)(18 eps)

as Self

as Riley Hallihan

as Henry L. Stimson

as J. Edgar Hoover

as J. Edgar Hoover

as Dr. Bartholomew (voice)(2 eps)

as Barbwire Salesman

as President Harry S. Truman

as Leland McKenzie

as Arthur Cambridge

as Self

as Cromwell

as Self

as Warden James Johnston

as Gen. Dwight D. Eisenhower

as Leland McKenzie

as Leland McKenzie(171 eps)

as Harvey Koster(2 eps)

as Dr. Nielsen

as Coy LaHood

as Abe

as Dr. Lee

as Louis B. Mayer

as Hunter Burgess

as Dr. Copper

as Dr. Morton Freeman

as Judge Russell R. Leggett

as Edwin Stanton

as Jack Warner

as Dr. Robert Allenby

as Secretary of Defense

as Gen. Dwight D. Eisenhower

as Trevor Isley

as Dr. Brennerman

as Aslaksen

as Peter Bailey

as President Ulysses S. Grant

as Dr. Kipness(1 ep)

as Leonard Driscoll(1 ep)

as Leonard Driscoll

as Lehman

as Claude Estee

as Master Bryant

as Father

as David Davis(2 eps)

as Dr. John Ellis

as Dr. Welbeck

as Max Duval(1 ep)

as Spengler

as Russ DeKuyper(1 ep)

as Barnes

as Jerry Arnst

as Motel Receptionist

as Jerry Arnst(1 ep)

as Tarleton(1 ep)

as Accountant (uncredited)

as Mr. Westfall(1 ep)