His character was adapted from the short-lived Disney Channel sitcom Good Morning, Miss Bliss; although that show was cancelled after one season, NBC executives believed that a similar show, with Zack Morris as the series lead, had potential for success.
He reprised the role in two TV movies and a less-successful spin-off, Saved by the Bell: The College Years. In 1996, he appeared in the TV-film She Cried No as a college student who date-rapes his best friend's sister at a fraternity party.
Montgomery — who recurred on This Is Us last season — joins an ensemble that includes Freema Agyeman (Sense8, Doctor Who) and Anupam Kher (Sense8).
The pair even enjoyed a real life love affair, as Mark-Paul previously revealed that when Saved By the Bell was in production he dated his three female co-stars Tiffani, Elizabeth Berkley and Lark Voorhies at different times.
In 1994, he appeared as Zack Morris in a second spin-off series Saved by the Bell: The New Class in the episode "Goodbye, Bayside – Part 2", along with Mario López as A. In 1998, he starred in the feature film, Dead Man on Campus.
Later that same year, Gosselaar played the central character in the TV drama Hyperion Bay, which lasted 17 episodes. From 2001-05, he played Detective John Clark on ABC's NYPD Blue.
In 2001, he starred in the movie The Princess and the Marine, with Marisol Nichols. After the series ended, he joined the cast of ABC's Commander in Chief, which lasted only one season.
He appeared on the HBO series John from Cincinnati.