When does Laverne & Shirley return?

Penny Marshall and Cindy Williams starred as Laverne DeFazio and Shirley Feeney. The series is a spin-off from Happy Days, as the two lead characters were introduced on that series as acquaintances of Fonzie (Henry Winkler) The original working title was LaVerne Defazio & Shirley Feenesy. In the final season without Cindy Williams, the chant is recited by a group of schoolchildren.