On Oct. 12, 1991, Kirstie Alley hosted Saturday Night Live for the first time. The experience included a sketch she’d later describe as the “most fun that I’ve ever had acting.” Alley’s star was soaring at the time. She’d joined the cast of the hit sitcom Cheers in 1987, playing Rebecca Howe, the foil to Ted Danson’s Sam Malone. Her 1989 film Look Who’s Talking was a massive box office success, cementing Alley as a Hollywood A-lister. The actress’ SNL hosting duties got off to a strong start. The opening monologue featured surprise appearances by Cheers castmates Danson, Woody Harrelson,...