Elenco - The Tenth Level
William Shatner
Prof. Stephen Turner
Lynn Carlin
Barbara
Ossie Davis
Reed
Viveca Lindfors
Mrs. Schnagel
Estelle Parsons
Crossland
Roy Poole
Dr. Goodman
Mike Kellin
Mancuso
Richard McKenzie
Mr. Dennison
Fred J. Scollay
Dr. McBride
Stephen Macht
Dahlquist
Lindsay Crouse
Karen
Charles White
Harry Vogel
Gregory Abels
Lab TechnicianRobert Burr
Mr. HughesTom Quinn
Bully in BarBillie Lou Watt
Mrs. Carol
Jeff Pomerantz
Professor
W.T. Martin
Mario, the WaiterGary Cookson
Lab Technician
John Travolta
Lab Technician (uncredited)