All Cast
Peter Graves
Jeff Knight
Eileen Dietz
Dana
Paulette Breen
Lena
Frank Ashmore
George Walker
Dick Sargent
Dr. Jameson
Zale Kessler
Dr. Nelson
William Bufkin
Clone
Tony Haig
Jack
Boyd Holister
Senator
Keenan Wynn
Jake Noble
Lurene Tuttle
Anna Noble
James Mantell
Ricky Knight
David Hooks
Richard Knight
Frank Birney
Reporter Birney
Rick DiAngelo
Guide #1
Eugene Robert Glazer
Guide #2 (as Gene Glazer)
Tim Donnelly
Richard (as Timothy Donnelly)