Bewitched rule number one: Never let dotty old Aunt Clara babysit your child. Unfortunately, Larry and Louise Tate leave their bouncing baby boy, Timothy, in Clara's care. While simultaneously watched both Timothy and Tabitha, fumbling Clara decides to entertain the babies with some magic -- and ends up transforming Tabitha into Timothy's identical twin. Sandra Gould makes her first appearance as busybody Gladys Kravitz, replacing the late Alice Pearce. Written by Howard Leeds, "Accidental Twins" first aired on October 6, 1966. ~ Hal Erickson, Rovi