 In the episode "Transition", Ellen and Jeff start a new life in the city after selling the farm to the Martin family (co-starring Cloris Leachman and Jon Shepodd) and giving Lassie to little Timmy Martin (played by child actor Jon Provost).Clayton appeared in only one more "Lassie" episode after those cast changes.In "Timmy's Family", broadcast originally in December 1957, she guest-starred in a supporting role to Lassie's new family.