- Ted Neeley - Jack Muldoon
- Gary Owens - Blaise Mullen
- Pernell Roberts - Clint Hollister
- René Auberjonois - Havergal
- Val Avery - Lew
- Pat Morita - Moby
- Michael Strong - Hugh Trevanian
- Sharon Farrell - Charlene Baker
- Carole Mallory - Vicki
- Ted Cassidy - Canja
- Kareem Abdul-Jabbar - Thark
- Harvey Jason - Dashki
- Noble Willingham - Artemus Washburn
- John Shea - Romeo
- Michele Carey - Belle
- Neville Brand - Stringer
- Billy Barty - Moxie
- Lisa Eilbacher - Juliet
- Timothy Scott - Caine
- Anthony James - Summersday
- Victor Buono - Mr. Schubert
- Dee Wallace - Hot Dog Stand Owner (as Dee Wallace-Stone)
- Jean Marie Hon - Cetacean crew
- Anson Downes - Cetacean crew
- Victoria Huxtable - Juliette Schubert (as Vicky Huxtable)
- J. Víctor López - Cetacean crew (as J. Victor Lopez)
- J. Víctor López - Cetacean crew( as J. Victor Lopez)
- J. Víctor López - Cetacean crew (as Victor Lopez)
- Arlene Martel - Carla(as Tasha Martell)
- Jamie Smith-Jackson - Bettina Washburn (as Jamie Smith Jackson)
- Ahna Capri - Louisa
- Mel Scott - Bert Davis
- Lyman Ward - Clavius
- Richard Gautier - Duke (as Dick Gautier)
- Larry Breeding - Buddy O'Toole
- Laurette Spang - Amanda Trevanian
- Lisa Blake Richards - Jenny Reynolds (as Lisa Richards)
- Donna Garrett - Student
- Herbert F. Solow
Lisa Eilbacher hace el papel de Juliet.
Anthony James hace el papel de Summersday.
Val Avery hace el papel de Lew.
Patrick Duffy hace el papel de Mark Harris.
Belinda Montgomery hace el papel de Dr. Elizabeth Merrill.
Alan Fudge interpreta a Dr. Crawford en la serie.
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