Monte Markham, Jandi Swanson and Holly Gagnier filmed for the Star Trek Franchise. Holly Gagnier Free Enterprise, had a guest role in Star Trek TNG and Monte Markham in DS9.
Jandi Swanson first appearance on Baywatch.
Shawn Weatherly (Jill) had a guest role in V.I.P. years later. The lead role in V.I.P. was played by Pamela Anderson, who became one of the main actors in later Baywatch seasons.
Billy and his co-star Erika Eleniak formed one of the most iconic couples on the show - and they were also engaged in real life.
Michael McManus (Sid) also had a guest role in Knight Rider. The main role on Knight Rider was played by David Hasselhoff.