"Charlie's Angels" premieres 1976

The first episode of the first regular season of Charlie's Angels aired September 22, 1976.  The pilot film aired earlier, in March, and received high ratings so it became a regular series.  The original cast featured Farrah Fawcett-Majors, Jaclyn Smith, Kate Jackson and David Boyle. 

The series enjoyed high ratings.  After Farrah Fawcett left the series after the first season, which resulted in lawsuits for breach of contract.  She agreed to come back for guest appearances.  Cheryl Ladd was brought in as Fawcett's character's sister.  Ratings dipped but recovered.

Then Kate Jackson left the series and they brought in Shelly Hack, but she lasted only one season.  Tanya Roberts was cast for the fifth season, but ratings never recovered after Jackson's departure and the series was cancelled.

Dark Shadows final episode 1971

The unapologetically campy Gothic horror series, Dark Shadows, aired its final episode April 2, 1971, after 5 seasons and 1225 episodes.  The saga of the Collins family, trying to escape its ancient curse, dealt with werewolves, withes, warlocks, time travel and, of course, vampires.  Jonathan Frid played the hugely popular Barnabas Collins.  It remains one of the top cult TV shows ever.

Throughout its run it also starred Joan Bennett, and Louis Edmonds (both of whom appeared in all episodes) Alexandra Isle (Victoria Winters) and Kate Jackson.