happy days was a spinoff from what us tv show
Happy Days Happy Days, itself a spin-off from Love, American Style, resulted in seven different spin-off series, including two that were animated: Laverne & Shirley, Blansky's Beauties, Mork & Mindy, Out of the Blue, Joanie Loves Chachi, The Fonz and the Happy Days Gang (animated) and Laverne & Shirley with Special Guest Star the Fonz (animated).