John Rose
— Philip Haller
Linda Southern
— Sunny
Sandra Peabody
— Joan Boyd (as Susan Sparling)
Will Patent
— Peter Yates
Thomas Murphy
— Howard Yates
Philip Baker Hall
— Father Reis
Alexander Gellman
— Gregory Haller
Edith Briden
— Nancy Haller
Stephen Snow
— Terry
George Linjeris
— Jim
Spalding Gray
— Radical at Party
Kelly Houser
— Man at Physical
Larry Hunter
— Detective
Lucy Grantham
— Susan (uncredited)