 O'Brien was a contestant on the ABC game show "The Big Showdown" in the mid-1970s, winning $5,000 for rolling "Show Down" during the timed dice roll round.In 1980, O'Brien reunited with his fellow Mouseketeers for a television special, in which he sang, danced and played drums.He also joined some of these same Mouseketeers for live shows on fall weekends at Disneyland during the early 1980s.