William Shatner
— Peter Gifford
Patty McCormack
— Janet Sommers
Lee Kinsolving
— Dan Carlyle
Virginia Field
— Mrs. Katie Sommers
Edward Platt
— Mr. Morton
Beau Bridges
— Stephen
Jocelyn Brando
— Mrs. Ryker
Phillip Terry
— Mr. Carlyle
Stephen Dunne
— Bobby Herman Sr.
Arch Johnson
— Mr. George Sommers
Judee Morton
— Charlene
Suzi Carnell
— Marge Ryker
Jan Norris
— Terry
Peter Virgo
— Fred - Dean of Boys
Stafford Repp
— Police Captain
Bruce Kerner
— Mark
Peter Virgo Jr.
— George
C. Lindsay Workman
— Science Teacher
David Geffen
— (uncredited extra)