The first season of Baywatch (or Babewatch as pretty much every teenage boy in the late 80s and early 90s called it) aired on NBC during the 1989-1990 season. It is basically a prime-time soap opera about a group of lifeguards in Southern California, led by Mitch Buchannan, played by David Hasselhoff. Hasselhoff was a couple of years removed from the popular series Knight Rider, and was definitely the big star of the series, especially during the first couple of seasons. The main cast in the first season included Hasselhoff, Parker Stevenson, Shawn Weatherly, Billy Warlock, Erika Eleniak, Peter Phelps, Brandon Call, Holly Gagnier, and Monte Markham. Later in the season, John Allen Nelson would join as a series regular and Gregory Alan Williams would be promoted to a series regular. Eleniak and Weatherly were the first "babes" that would become what the show was known for, and Elaniak was actually the first member of the cast to pose for Playboy, although she did so shortly before the show aired.
The show was pretty much a story-of-the-week procedural. In the first season, the stories were almost all laughably bad (like a group of hooligans using an illegal version of a jet ski to terrorize swimmers and boaters), and even when the show tried to tackle a deeper subject (like domestic violence) it was often cringe-inducing. And of course, there were the totally silly and often out of place (and out of nowhere) music montages that just spontaneously popped up once or twice an episode. The writers did try to balance the large ensemble cast, but there were many episodes in which some of the main cast members were totally absent, and Peter Phelps just disappeared in the second half of the season.
The season did feature a lot of guest stars, many of whom would go on to be A-Listers, who basically got their start on the show as their first major role. Some of them included Mariska Hargitay (who would go on to be the lead on Law and Order SVU), David Spade, William Fichtner, Bryan Cranston (who would go on to be the lead on Breaking Bad), and Madchen Amick (who would be a series regular on Twin Peaks the next year).
The first season was really about the show finding its footing and developing the main characters. It was definitely not a great show in terms of being an award-winning drama. It was a great show in terms of being so bad it was good, and of course, had a ridiculously good-looking cast. It will definitely be a nostalgic blast from the past for those who grew up in the 1980s and 1990s. There are some DVD sets out there that label Season 2 as Season 1. NBC actually canceled the show after Season 1, after which it aired in syndication for the rest of its run. So, make sure to pay attention to the description.