In addition to his role on The Love Boat, Kopell also made memorable appearances as KAOS agent Siegfried in Get Smart, Alan-a-Dale in When Things Were Rotten, Jerry Bauman in That Girl and Louie Pallucci in The Doris Day Show.
Kopell also played several characters on the sitcom Bewitched including the witches’ Apothecary, and the warlock Alonzo in episode # 239, “The Warlock in the Gray Flannel Suit.” He played a director in an episode of Alfred Hitchcock Presents (“Good-Bye George,” original air date December 13, 1963). About this same time, he guest starred on Phil Silvers‘s unsuccessful sitcom The New Phil Silvers Show on CBS. He had a cameo as a patient in the Scrubs episode, “My Friend the Doctor“, as well as an episode of the Disney Channel Original Series, The Suite Life of Zack & Cody. He also portrayed a plastic surgeon who gave Ed Brown a facelift on Chico and the Man. He also appeared on an episode of “Charmed” entitled “Which Prue is it Anyway” as a coroner.
Kopell made a cameo appearance in the 2008 film adaptation of Get Smart. Recently he has been seen in television advertisements for Nasalcrom, carefully enunciating the product’s name and assuring viewers “that’s right, it’s a spray”.
Kopell has also appeared as guest star in the Monk episode “Mr. Monk and the Critic”, playing Mr. Gilson, the restroom attendant. Kopell also guest starred in a 2009 episode of My Name is Earl entitled “Pinky.”
Kopell has performed in the theater and played the lead role in the off Broadway production of “Viagra Falls” in 2010