The Season 3 Happy Days episode, titled “A Date With Fonzie,” aired on Nov. 11, 1975, with guest stars Penny Marshall and Cindy Williams as Laverne and Shirley, two “fast” friends of Fonzie’s (Henry ...

Happy Days spawned several spinoff series during its 11-season run—who can forget Joanie Loves Chachi, even if they’d like to?— but the very first spinoff was Laverne & Shirley. The sitcom, about ...