James Spader as Morgan Hiller

Kim Richards as Frankie Croyden

Paul Mones as Nick Hauser

Matt Clark as Stuart Hiller

Claudette Nevins as Page Hiller

Olivia Barash as Ronnie

Robert Downey Jr. as Jimmy Parker

Panchito Gómez as Mickey

Michael Wyle as Eddie

Catya Sassoon as Feather

Francis X. McCarthy as Man at Bus Stop

Art Evans as Security Guard

Herb Mitchell as Mr. Russell

Ceil Cabot as Secretary

Donald Fullilove as Howard

Vivian Brown as History Teacher

Bill Beyers as Brian Hiller

Jered Barclay as Reynolds

Lou Fant as Mr. Croyden

Gene Pietragallo as Donnie Parker

Donna Fuller as Nurse

Evonne Kezios as Muffy

Cheryl Ann Clark as Patty

Matt Gavin as Alan

Chad McCann as Troy

William Bergman as Jack Mack and the Heart Attack - Tenor Sax

John Berry Jr. as Jack Mack and the Heart Attack - Trumpet

Rick Braun as Jack Mack and the Heart Attack - Trumpet, Vocals

Mark Campbell as Jack Mack and the Heart Attack - Lead Vocals

James R. Coile as Jack Mack and the Heart Attack - Tenor Sax

Peter Freiberger as Jack Mack and the Heart Attack - Bass

Andrew Kastner as Jack Mack and the Heart Attack - Guitar

Jack Mack as Jack Mack and the Heart Attack - Drums, Vocals

John Paruolo as Jack Mack and the Heart Attack - Keyboards

Greg Smith as Jack Mack and the Heart Attack - Baritone Sax

Dale Gonyea as Country Club Band Leader

Randy Lowell as Country Club Band

Jon Ewen as Country Club Band

Tom McShane as Country Club Band

Wes Moczulski as Country Club Band

Ray Zimmerman as Country Club Band

Jim Carroll as Self

Eric Kiertzner as Warehouse Band

Mike Lea as Warehouse Band

Tom Sims as Warehouse Band