Frankie Muniz was 8 when he landed his first acting role. He says it ‘took over’ his life.

After the series ended, the actor appeared in several other film and television roles. He balanced it with his long-time interest, NASCAR racing.

Looking back, Muniz confessed he hadn’t watched Malcolm in the Middle in its entirety until about four years ago.

“… I didn’t watch the show until maybe four years ago and I watched all 151 episodes, and it was such a weird thing because I thought the show was a completely different show — like the comedy, everything,” he explained on I’m A Celeb.

“Even the characters — characters I thought were great weren’t actually great and the characters I thought were dumb were the best characters… It was a weird thing to watch later… I just accepted that I was on a good show. People liked the show.”

Being a child star was hard work for the then-teen, who said he didn’t really ever remember taking a break. “I think if I added up the days off I had, it might have been 30 days in the 12 years, because it just went non-stop,” he said.

From late 2007 through 2008, Muniz put his acting career on hold to compete in the Atlantic Championship Series car race, where he came 11th.

“I was at the height of my career and I called my agents and managers like, ‘I don’t want to do any acting right now. I’m gonna focus on racing,'” he recalled. “They were like, ‘Yeah, yeah.’ They’d call me with offers… and I said, ‘I’m serious. I’m not doing anything.'”