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Jack Stewart in the medical-mystery-drama series Diagnosis: Murder (1993–1995), and the titular hero of the musical film Bugsy Malone (1976), his onscreen debut.
Baio has guest-starred on various television programs, appeared in several independent films, and starred on the Nickelodeon sitcom See Dad Run (2012–2015).
In 1985, he was part of an ensemble cast for Alice in Wonderland, where he portrayed Pat the Pig.
From 1987 through 1991, he was a director of the children's comedy series Out of This World.
From 1979 to 1984, Baio made seven appearances on Battle of the Network Stars; six as a competitor for the ABC team (once as team captain) and one as co-host with Howard Cosell.
He also starred in the made-for-television youth drama specials The Boy Who Drank Too Much with Lance Kerwin and Senior Trip with Mickey Rooney.
In 1982, Baio was in a spin-off of Happy Days entitled Joanie Loves Chachi with Erin Moran, which lasted only seventeen episodes.
During the 1990s, Baio appeared in various television programs, including the short-lived Look Who's Talking small screen spin-off Baby Talk.
In 1991, he joined Diana Muldaur and Ally Walker in the NBC Monday Night Movie Perry Mason and the Case of the Fatal Fashion, as a young prosecutor. Jack Stewart in the medical mystery series Diagnosis: Murder starring Dick Van Dyke.
Baio was a guest-star on many series, including Full House, Touched by an Angel, Veronica's Closet and The Nanny.