S2, E20: Guest Tim Conway breaks up Harvey in one of the series' all-time funniest sketches: "The Dentist." Also: jealous understudy Carol looks to steal the show from a Broadway star (guest Ethel Merman.)

Starring Ethel Merman, Tim Conway

S2, E20: Guest Tim Conway breaks up Harvey in one of the series' all-time funniest sketches: "The Dentist." Also: jealous understudy Carol looks to steal the show from a Broadway star (guest Ethel Merman.)