- Ritch Brinkley - Bart
- Eric Christmas - Dr. Momquist
- June Allyson - Bessie
- Mickey Jones - Arnold Biefnieter
- Kenneth Mars - Sen. Donner
- Edward Winter - Dr. Strickland
- Sid Haig - Swarthy Man
- Ric Mancini - Kovich
- Joan Sweeny - Didi
- Eda Reiss Merin - Erma
- Diane Cary - Miss Nance
- Ray Walston - Barney
- Dan Lauria - Project Manager
- Dennis Stewart - Taggart
- Rodney Saulsberry - Technician
- Lou Felder - Governor
- David Selburg - Cusak
- John Stinson - Aide
- Robert Covarrubias - Les
- Carlos Lacámara - Fredo
- Catherine Paolone - Woman
- Kerry Noonan - Demonstrator #1
- Larry Linville - Gen. Thiel
- Dean Devlin - Angel
- Tony Acierto - Ramon
- Shane McCamey - Driver
- Bob Larkin - Augie
- Matthew Faison - Maitre D'
- Theodore Lehmann - Old Man
- Rob Roy Fitzgerald - Explorer
- David Blackwood - Clerk
- Michael Blue - Rich Man
- James Sloyan - Harry
- Gary Riley - Josh
- Tom Bower - Jeffries
- John Zarchen - Kelp
- Michael Crabtree - Front Yard / Back of Van Investigator
- Reid Smith - Backyard Investigator
- Lewis Dauber - Man with Children
- John Mahon - Technician
- Roy Fegan - M. P.
- Carl D. Parker - Old Man
- Bill Dearth - Sergeant
- Jesse Dizon - Link
- Allan Rich - Dr. Komack
- Stephanie Faulkner - Dr. Deanna Walter
- Richard Brose - Rambo Type Man
- S.A. Griffin - Pusher
- Branscombe Richmond - Man
- Paul Roache - Security Guard
- Allan Graf - Construction Worker
- Ellis Levinson - Agonized Man
- Mic Rodgers - Policeman
- Patrika Darbo - Woman Tourist
- Dale Robinette - Brick Tyler
- Greta Blackburn - Alexis
- Tige Andrews - Bill
- Clement von Franckenstein - Croupier
- Alain Saint-Alix - Dealer
- Marius Mazmanian - Bernard
- Joel Polis - Lonnie / Dwayne
- Warren Munson - Murcho
- Paul Koslo - Skinner
- Roy Firestone - Keith
- James Hornbeck - Rice
- Courtney Gains - Mechanic
- Paunita Nichols - Reporter #2
- Julie Inouye - Woman Reporter
- Mary Ingersoll - Newswoman
- James D. Parriott
- Karen Lawrence
Kevin Peter Hall interpreta a Dr. Elvin 'El' Lincoln en la serie.
Courteney Cox interpreta a Gloria Dinallo en la serie.
Max Wright interpreta a Dick Stetmeyer en la serie.
Dean Paul Martin interpreta a Dr. Billy Hayes en la serie.
Mark Thomas Miller interpreta a John 'Johnny B' Bukowski en la serie.
Jennifer Holmes interpreta a Jane Miller en la serie.
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