William Shatner

Prof. Stephen Turner

Acting

Lynn Carlin

Barbara

Acting

Ossie Davis

Reed

Acting

Viveca Lindfors

Mrs. Schnagel

Acting

Estelle Parsons

Crossland

Acting

Roy Poole

Dr. Goodman

Acting

Mike Kellin

Mancuso

Acting

Richard McKenzie

Mr. Dennison

Acting

Fred J. Scollay

Dr. McBride

Acting

Stephen Macht

Dahlquist

Acting

Lindsay Crouse

Karen

Acting

Charles White

Harry Vogel

Acting

Gregory Abels

Lab Technician

Acting

Robert Burr

Mr. Hughes

Acting

Tom Quinn

Bully in Bar

Acting

Billie Lou Watt

Mrs. Carol

Acting

Michael Howard

Acting

Jeff Pomerantz

Professor

Acting

Damon Evans

Acting

W.T. Martin

Mario, the Waiter

Acting

Gary Cookson

Lab Technician

Acting

John Travolta

Lab Technician (uncredited)

Acting