Why Was Dewey Recast in the Malcolm in the Middle Revival?

'Malcolm in the Middle: Life's Still Unfair' is now streaming

NEED TO KNOW

• The Malcolm in the Middle revival, Malcolm in the Middle: Life’s Still Unfair, premiered on April 10
• Most of the sitcom’s original cast is back, except for Erik Per Sullivan, who played Malcolm’s younger brother, Dewey
• Caleb Ellsworth-Clark takes over the role in the new four-episode revival

It's a family reunion in the new Malcolm in the Middle revival — but one of the sitcom's original actors is absent from the latest antics.

Malcolm in the Middle was about an average, yet chaotic, dysfunctional American family. The sitcom, which premiered in January 2000, followed boy genius Malcolm (Frankie Muniz) as he tried to survive life with his two eccentric parents, Hal (Bryan Cranston) and Lois (Jane Kaczmarek), and four offbeat brothers: Francis (Christopher Masterson), Reese (Justin Berfield), Dewey (Erik Per Sullivan) and Jamie (portrayed by twins James and Lukas Rodriguez).

The Fox comedy eventually ended in May 2006 after seven seasons and 151 episodes, though viewers were left on a cliffhanger. The series abruptly concluded with Lois' shocking pregnancy news and Malcolm just starting his freshman year at Harvard.

After years of reboot rumblings, Disney+ announced a four-episode revival of Malcolm in the Middle in December 2024.

“Malcolm in the Middle is a landmark sitcom that captured the essence of family life with humor, heart and relatability,” Ayo Davis, president of Disney Branded Television, said in a statement, per Deadline. “Its hilarious and heartfelt portrayal of a lovably chaotic family resonated with audiences of all ages, and we’re so excited to welcome the original cast back to bring that magic to life again."

Most of the original cast members have returned for the 2026 limited run. However, Per Sullivan is not among them. The actor portrayed Malcolm's younger brother Dewey, known for his smarts and wit. Those memorable traits, though, will now be brought back to life by a different actor.

So why did Dewey get recast in the Malcolm in the Middle revival? Here's everything to know about Erik Per Sullivan's absence.

What is the Malcolm in the Middle revival about?

The Malcolm in the Middle revival, titled Malcolm in the Middle: Life's Still Unfair, consists of four episodes and follows Malcolm and his daughter as they are "drawn into the family's chaos when Hal and Lois demand his presence for their 40th wedding anniversary party," according to a press release.

Who will be in the Malcolm in the Middle revival?

Frankie Muniz, Bryan Cranston, Jane Kaczmarek, Christopher Masterson and Justin Berfield reprise their roles in the Malcolm in the Middle revival, as Variety reported in March 2025.

Newcomers include Anthony Timpano, who plays Malcolm's youngest brother, Jamie, and Vaughan Murrae, who portrays Malcolm's youngest sibling, Kelly. As fans may remember, Lois was pregnant with her sixth child in the 2006 series finale.

Malcolm's daughter, Leah, is played by Keeley Karsten. Meanwhile, Kiana Madeira portrays his "charming and opinionated" girlfriend Tristan who "is way out of his league," per Variety. It's unclear if she is also Leah's mom.

Who is playing Dewey in the Malcolm in the Middle revival?

Caleb Ellsworth-Clark will step into the role of Dewey — Malcolm's musically gifted and lovable younger brother, originally played by Per Sullivan.

Ellsworth-Clark has been acting since 2013, earning his first credits in The Right Kind of Wrong and the TV series Hell on Wheels. He went on to appear in four episodes of Wynonna Earp.

After landing minor parts in other projects, such as The Handmaid’s Tale and Fargo, Ellsworth-Clark got cast in his first lead role for the Malcolm in the Middle revival.

Why was Dewey recast in the Malcolm in the Middle revival?

After the original Malcolm in the Middle ended in 2006, Per Sullivan continued acting for a few more years before seemingly stopping altogether. According to IMDb, his last on-screen appearance was in 2010 when he played Timmy in Twelve.

Since then, Per Sullivan appears to have left Hollywood and is maintaining a private life. In April 2024, Kaczmarek shared a rare update about her on-screen son during an interview with Malcolm France at the Paris Manga Sci-fi Show by TGS.

The actress explained that Per Sullivan's interest in acting changed over time, and he shifted his focus to his education.

"He's very very well," she said. "He did Malcolm for seven years. He started at 7, he ended at 14. He wasn't interested in acting at all."

Kaczmarek revealed that Per Sullivan is currently studying Victorian literature at "a very prestigious American university" that the former actor requested she not name.

"I admire it too because so many people think being in show business is the greatest thing in the world. It's not for everyone," the actress added.

Per Sullivan was photographed in Boston in April 2025, where he made a rare outing while running errands and holding a cup of coffee.

In April 2026, Kaczmarek told The Guardian that Per Sullivan is getting his master's degree at Harvard.

"He’s studying Dickens and is an incredible student," she said. "They offered him buckets of money to come back, and he just said: 'No thank you.' "

Why did the original Malcolm in the Middle get canceled?

Fox ultimately canceled Malcolm in the Middle after seven seasons due to low ratings.

In 2000, the pilot episode drew 22.4 million viewers, according to The New York Times, and the show went on to average 13 to 15 million viewers in its early seasons. Unfortunately, season 4 dropped to 10 million viewers, and by season 6, that number was cut nearly in half.

"Fox is proud to have been the home of this groundbreaking comedy," Peter Liguori, former president of entertainment, said in a January 2006 statement, per MovieWeb. "From its innovative production values to its exceptional writers and cast, this series has helped shape the modern sitcom. We'll miss this hilariously loud and manic – yet somehow relatable and admirable — family."

Since the show's conclusion in the early aughts, most of the main cast members have continued acting and tried different hats as well. Notably, Muniz pursued his lifelong dream of being a race car driver.

In October 2024, he earned a spot in the 2025 season of the NASCAR Craftsman Truck Series.

"I think at first, maybe people thought it was like a hobby," he told PEOPLE in March 2025. "I don't necessarily worry about what anyone says. You earn respect as a driver when you're out there competing and beating them, right? That's what I'm trying to do."

Muniz continued, "That is the name of the game, right? Is to try to be the fastest. I want to beat everybody."

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