Denise Crosby
There are people made to follow in the footsteps of their families. Denise Michelle Crosby is one such person. She is not only the daughter of Dennis Crosby but also the granddaughter of Bing Crosby. She dropped out of college and shocked everyone when she revealed the truth about her lineage. The star appeared in Playboy but ended up leaving the show because it did not feel like she could do much in it.
Joan Collins as Edith Keeler
Are you aware that Dame Joan Collins appeared in an episode of the show? It is called “The City on the Edge of Forever” and came out in 1967. She played Edith Keeler, yet another interest of Kirk on the show. She eventually became a household name for playing Alexis Colby in Dynasty.