1980s

In 1986, he appeared in a five-episode arc of Punky Brewster, as rule-obsessed but unfeeling DCFS social worker Simon Chillings, originally charged with Henry's petition to adopt Punky, but who instead removes her from Henry's care, concerned Henry could not adequately support her after his business burns down and he is hospitalized with an ulcer. Convinced Punky would be permanently better off with another foster family, he places her with a wealthy couple, Jules and Tiffany Buckworth. Ultimately, Jules Buckworth leaves Tiffany and returns Punky to Henry, who completes the adoption. When Simon calls Henry's new studio to congratulate him on the adoption, he reaches Mike, who laughs, reminding him he was the one trying to keep them apart. Simon states that he has quit his job with DCFS and has become romantically involved with Tiffany Buckworth.

1990s and early 2000s

In the early 1990s, Stack appeared as the father of the main character on Parker Lewis Can't Lose. He later starred as Dick Dietrick on the raunchy talk show send-up/satire Night Stand with Dick Dietrick.

Stack then played Notch Johnson on Son of the Beach, a Howard Stern-produced Baywatch send-up which aired on the FX cable channel from 2000 to 2002.