Thomas, 31, will play the manager of a high-end restaurant where the daughter of Allen's character, Kristin (Amanda Fuller), applies for a job. The episode is slated to air in March or April.
The appearance comes after Thomas, Allen and the rest of the Home Improvement cast reunited for Entertainment Weekly in the fall of 2011.
Thomas left Home Improvement one season before it ended its run to focus on his academics. After that, he appeared sporadically on a handful of TV shows including Smallville, 8 Simple Rules and most recently Veronica Mars back in 2005. Earlier this season on Last Man Standing, Home Improvement's Richard Karn guest-starred as an architect working with Allen's character.
Last Man Standing airs Fridays at 8/7c on ABC. Are you excited to see TV father and son back together?