E.G. Marshall

as Self

as The President

as (archival footage)

as Narrator

as Lawrence Preston

as Lawrence Preston

as The Senate Chairman

as Walter Sullivan

as John Mitchell

as Arthur Thurmond (22 episodes)

as Professor Taw

as Professor Taw (2 episodes)

as Narrator (8 episodes)

as Self - Narrator (voice)

as Ev Hillman (2 episodes)

as Narrator 1

as Gideon Welles (voice)

as George Gordon

as Reader (voice)

as Joe Meadows

as Commdr. Smith

as Steven Pike

as Art

as Host

as Stanley 'Stan' Kubacki