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The reunion offered fans a rare glimpse of Thomas, who largely stepped away from Hollywood after becoming one of the biggest child stars of the 1990s.

The  Home Improvement  cast included Zachery Ty Bryan, Tim Allen, Patricia Richardson, Jonathan Taylor Thomas, Taran Noah Smith, Richard Karn, Debbe Dunning and Earl Hindman. (ABC Photo Archives/Disney General Entertainment Content via Getty Images)

Thomas rose to fame as Randy Taylor on  Home Improvement  and became a major teen heartthrob, appearing in films, including  Tom and Huck  and  Man of the House.  He also voiced young Simba in Disney's 1994 blockbuster  The Lion King. 

But at the height of his fame, Thomas made a surprising decision to walk away.

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 I'd been going nonstop since I was 8 years old,  Thomas told People in 2013.  I wanted to go to school, to travel and have a bit of a break. 

Jonathan Taylor Thomas attended the WB Network's 2003 Winter Party. (Getty Images)

Thomas left  Home Improvement  during its eighth and final season , with his character moving to Costa Rica.

Although he largely stayed out of the spotlight, Thomas briefly returned to acting, reuniting with TV dad Tim Allen on   Last Man Standing   from 2013 to 2015. He appeared in four episodes and directed three.

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Fox News Digital's Stephanie Giang-Paunon contributed to this report.