Jim Belushi
— Nick Dimas
Liza Minnelli
— Stevie Merrill
Michael S. O'Rourke
— Kirk O'Brien (as Michael O'Rourke)
James Brolin
— Professor Spencer Jones
Helen Slater
— Elsa Freedman
LeVar Burton
— Dr. Franklin Carter
Jack Klugman
— Senator Robert Ferguson
Grant Varjas
— Grayson Stone
Patricia Wettig
— Rebecca Ferguson Stone
Ben Gazzara
— Charlie Duke
Mira Sorvino
— Matty Derosa
Lindsay Crouse
— Una Pace
Paul Sorvino
— Ed Starling
Matthew Perry
— Willie Morrison
David Lansbury
— Tim Farley
JoBeth Williams
— Winnie Winslow
Ally Sheedy
— Louise
Jill Eikenberry
— Lula Sparks
Treat Williams
— Peter Barnum
Dudley Moore
— Imaginary Friend / President Andrews
Gena Rowlands
— Francie Pomerantz
Zosia Mamet
— Shannon
Liza Dicconson
— Female Lover
Timothy Mineau
— Male Lover
Alan Feinstein
— Dan Merrill
Robert Wagner
— Sheriff