- Kenneth Tobey - Sergeant Baker
- Sharon Farrell - Pam Canford
- Don Marshall - Pvt. Ernest Cameron
- John Doucette - Sgt. Clintock
- Harold Gould - Lt. Col. Raleigh Wade
- John Milford - Sgt. Ben Kagey
- Jeremy Slate - Lt. Virgil Scott Boxer
- Dennis Hopper - Cpl. Peter Devlin
- Rip Torn - Sgt. Karl Kasten
- Henry Beckman - Major Al Barker
- Majel Barrett - Ruth Donaldson
- Conrad Nagel - Admiral Terence Havener
- Danny Lockin - Bellhop
- Nichelle Nichols - Norma Bartlett
- Woody Strode - Sgt. Logan Holt
- Madlyn Rhue - Jackie Madian
- John Hart - Capt. Adam Quincy
- Rita Lynn - Social Worker
- James Drake - Intern
- Fletcher Fist - M.P. Officer
- Neva Patterson - Vera Delwyn
- Walter Koenig - Sgt. John Delwyn
- Hal Taggart - Observer at Rally (uncredited)
- Sherry Jackson - Maggie Shea
- Strother Martin - Taxi Driver
- Ray Teal - Mr. Coolidge
- Kitty Kelly - Housekeeper
- Tom Nardini - 1st Private
- George O'Hanlon - Jeweler
- Eddie Carroll - Pvt. Z. Wesley Martin
- Gary Pagett - Pvt. Lester Baxter
- Mike Minor - Radio Operator
- Chris Hughes - 1st Boy
- Linda Evans - Nan Hiland
- Yale Summers - Lt. Barry Everest
- Steve Franken - Sampan
- Susan Silo - Marie Eckles
- Stuart Margolin - Cpl. Merle Purveau
- Ina Balin - Jan Everest
- Barbara Babcock - Doris Broxton
- Mario Roccuzzo - Jeep Driver
- Mario Roccuzzo - Pvt. Brian Barducci
- John Dennis - Major
- Bill Bixby - Pvt. Stu Sallaway
- Russell Thorson - Mr. Sallaway
- Richard Anderson - Col. Clinton Hiland
- Richard Anderson - Lt. Col. Clinton Hiland
- Katharine Ross - Elizabeth Sharp
- Penny Santon - Mrs. Gorson
- Dorothy Neumann - Alice Lanyard
- Greg Morris - Crew Chief
- Greg Morris - Sgt. Perc Linden
- Andrew Prine - Lt. Gerald Allison
- Pat Priest - Waitress
- Marlyn Mason - Carol Jean Wandemeyer
- Andrew Duggan - Peter Bonney
- Martine Bartlett - Stella Bonney
- Russ Conway - Col. Curtis Morley
- Leonard Nimoy - Gregg Sanders
- George Cisar - Jerry Walters
- Paul Burke - Capt. Kenneth Thomson
- Lisabeth Hush - Mrs. Thomson
- Carmen Phillips - Lily
- Norman Felton
Leonard Nimoy hace el papel de Gregg Sanders.
Nichelle Nichols interpreta a Norma Bartlett en la serie.
Dennis Hopper hace el papel de Cpl. Peter Devlin.
Majel Barrett interpreta a Ruth Donaldson en la serie.
Gary Lockwood hace el papel de Lt. William 'Bill' Rice.
Robert Vaughn interpreta a Captain Ray Rambridge en la serie.
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