Home Improvement stars Richard Karn and Tim Allen reunited this week as the two have begun work on their new television series. For years, we saw Allen and Karn co-hosting the fictional home improvement series Tool Time as Tim "The Tool Man" Taylor and Al Borland. The two are back to work together on a new building competition show for History, and this week, Karn tweeted a photo of himself alongside Allen on the set from the first day of shooting.

"First day of shooting... this show is going to be amazing!!" Karn writes in the caption. Called Assembly Required, the 10-episode building competition series will "spotlight the best and brightest builders from across the country, at their home workshops, as they compete to breathe new life into everyday household items in desperate need of fixing. This new series will push each contestant to their limits while testing their ability and ingenuity to not only rebuild it but to build it better."

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"Let's face it - we're living in a throwaway society," Tim Allen said of the upcoming series in August. "We buy, break, replace ... rinse and repeat. Whatever happened to repair and rebuild? There are some people who unfriend, unfollow and dispose of anything that offends, annoys or breaks - so I've created a show to remind people of the satisfaction and pride that comes from rebuilding something on their own. And who better to join me than my buddy from the old Tool Time days - Richard Karn! Now we're talking 'More Power'!"

Richard Karn and Tim Allen will appear in each episode to speak about the history around the items highlighted on the show, celebrating the men and women who crafted them. While we've seen Karn and Allen reunite sporadically over the years, this will be the first time the two have both been featured regularly in a television series since Home Improvement went off the air in 1999. Both have been featured in various cast reunion specials, and Allen also appeared in two episodes of Allen's sitcom Last Man Standing.

Home Improvement aired for eight seasons between 1991 and 1999. Along with Allen and Karn, the series starred Patricia Richardson, Jonathan Taylor Thomas, Taran Noah Smith, Zachery Ty Bryan, and Earl Hindman. There's still a chance we could see Home Improvement get some kind of revival, so we just might see Allen and Karn as Tim and Al once again. Just this year, Allen told TVLine he was still open to the idea of a revival, though he suggested it'd likely be a one-off special as opposed to a full-fledged reboot series.

"I like the idea of doing it as a one-off, like a one-hour movie. I like the idea of finding out where the boys are now, and where... Tool Time would be in today's world. I just think it's a marvelous idea, and all the actors think it's a great idea," Allen said in February.

Since leaving Home Improvement, Karn served as a host for Family Feud for several years. He has also become a star of many Hallmark Christmas movies and multiple Air Bud sequels. More recently, he appeared in the Hulu series PEN15. Meanwhile, Allen has continued to provide the voice of Buzz Lightyear in Toy Story sequels along with starring in the lead role of the comedy series Last Man Standing.

A release date hasn't yet been announced for Assembly Required, but it's expected to premiere in History in 2021. The new photo from the set of Assembly Required was posted by Richard Karn on Twitter.

Assembly Required Tim Allen and Richard Karn photo