Shirley begins dating a doctor. Everything is going fine at first, and the good doctor has brought over his son, Bobby, to stay with the girls. Lenny and Squiggy enjoy playing with Bobby and dress him up like a ventriloquist dummy.
At Cowboy Bill's, Laverne tries to play guitar while singing an off-key number, and it's not music to Bobby's ears. Bobby's mother comes in, and Bobby runs to her. Laverne is stunned as the woman looks exactly like Shirley but with blonde hair. She doesn't know how she'll break the news to Shirley.