Cliff Robertson as Lee Tucker

Joel Grey as Franklin Wills

Dorothy Tristan as Janet Tucker

Elizabeth Wilson as Dr. Anna Willson

George Voskovec as Dr. Nicholas Holnar

Ron Weyand as Dr. Philip Fusco

Peter Masterson as Willie Younger

Lane Smith as Ted Ronan

Joe Ponazecki as Dan Lloyd

Christopher Allport as Richie Tom Keating

Patricia Hawkins as Diana Spenser

Richard Venture as Man in Motel

Dianne Hull as Maggie Dawson

Gil Gerard as Donald Forbes

Robert Dryden as Mr. Dawson

Alice Drummond as Mrs. Dawson

Richard McKenzie as Sam Gallagher

Brendan Fay as Father Connally

Clarice Blackburn as Mrs. Brennan

Nicholas Pryor as Paul Kearney

Josef Sommer as Pete Russell

Shawn Campbell as Steve Barron

Ben Slack as Ronnie

Clarence Felder as Coach

Penelope Milford as Evelyn Moore

Bruce French as Check-Out Man

Loretta Fury as Mrs. Segretta

Roy Mason as Plant Manager

James Galvin as Man in Plant

Carson Grant as Swimmer (uncredited)