Charlie's Angels was a television series made during the late 1970s and early 1980s, about three women who work for a fictional private investigation agency, the Charles Townsend Agency. Their boss, Charlie (voiced by John Forsythe), was never seen--except in one episode from the rear only (where you only saw the back of his head and his arms)--and contacted them only by phone.
The three original "angels" were played by Kate Jackson, Farrah Fawcett-Majors, and Jaclyn Smith. Later, when a character left (because the actress went on to other projects, etc) another "angel" was brought on to keep the number at three: Cheryl Ladd, Shelley Hack, and Tanya Roberts also starred as angels.
David Doyle played Charlie's assistant, Bosley.
Because the show's premise focused on the angels using a combination of sexual wiles and fierce knowledge (of seemingly every subject in the entire world) the show became known as "T&A T.V." (or "Tits and Ass television"). The angels would often be seen scantily clad for no apparent reason other than to showcase the figures of the actresses.
The television series inspired two movies in the 2000s: Charlie's Angels (2000) and Charlie's Angels: Full Throttle (2003).
Each was directed by McG and starred Cameron Diaz, Drew Barrymore, and Lucy Liu as the three angels, with John Forsythe returning as Charlie.
Bosley (John of that ilk) was played in the first film by Bill Murray, and in the second (as John's half-brother Jimmy) by Bernie Mac.