Jim Boyd, who was strictly an off-cameravoice actorand puppeteer during the first season, began appearing on-camera in the second season, mostly in the role of J. Arthur Crank.Luis Ávalosalso joined the cast at that time.
Cosby was a regular in season one, and occasionally appeared in new segments during season two, but left afterward. Nevertheless, segments that Cosby had taped during seasons one and two were repeatedly used for the rest of the run, and Cosby was billed as a cast member throughout. Similarly, Chamberlin also left after season two, but many of her segments were also repeatedly reused; consequently, she was also billed as a cast member for the rest of the show's run.
Added to the cast at the beginning of season three (1973–1974) wasHattie Winston, an actress and singer who later appeared on the showBecker.Beginning in season four (1974–1975), Danny Seagren, a puppeteer who had worked onSesame Streetand also as a professional dancer, appeared in the role ofSpider-Man;Marvel Comicspublished a title,Spidey Super Stories,that tied into Seagren's appearances as Spider-Man, in character as whom he never spoke aloud or unmasked himself.