Charlie's Angels - Season 1 - Eps 21: Angels at Sea
In a series of conspicuous accidents aboard a cruise ship to Hawaii, a young couple is murdered. The ship's owner hires the Angels to investigate. The murderer knows the Angels' true identities from the start and sends them death threats.
About Charlie's Angels

Title: Charlie's Angels
First Air Date: 1976-09-22
Last Air Date: 1981-06-24
Status: Ended
Rating: 6.676/10 (from 210 votes)
Language: EN
Seasons: 6
Total Episodes: 115
Network: ABC
Genres: Action & Adventure
Production Companies: Spelling-Goldberg Productions, Columbia Pictures Television
Synopsis
Beautiful, intelligent, and ultra-sophisticated, Charlie's Angels are everything a man could dream of... and way more than they could ever handle! Receiving their orders via speaker phone from their never seen boss, Charlie, the Angels employ their incomparable sleuthing and combat skills, as well as their lethal feminine charm, to crack even the most seemingly insurmountable of cases.
Cast

Jaclyn Smith
Kelly Garrett

Cheryl Ladd
Kris Munroe

Tanya Roberts
Julie Rogers

David Doyle
John Bosley

John Forsythe
Charles Townsend (voice)