Groucho and Chico briefly appeared in a 1957 color short film promoting "The Saturday Evening Post" entitled "Showdown at Ulcer Gulch", directed by animator Shamus Culhane, Chico's son-in-law. Groucho, Chico, and Harpo worked together (in separate scenes) in "The Story of Mankind" (1957). In 1959, the three began production of "Deputy Seraph", a TV series starring Harpo and Chico as blundering angels, and Groucho (in every third episode) as their boss, the "Deputy Seraph". The project was abandoned when Chico was found to be uninsurable (and incapable of memorizing his lines) due to severe arteriosclerosis. On March 8 of that year, Chico and Harpo starred as bumbling thieves in "The Incredible Jewel Robbery", a half-hour pantomimed episode of the "General Electric Theater" on CBS. Groucho made a cameo appearance — uncredited, because of constraints in his NBC contract — in the last scene, and delivered the only line of dialogue ("We won't talk until we see our lawyer!").