Joe Scheffer (TIM ALLEN) is a video communications specialist - a.ka. the A/V guy - whose life has been better. Although he has a good relationship with his 12-year-old daughter, Natalie (HAYDEN PANETTIERE), he's now divorced from her mother, Callie (KELLY LYNCH), and isn't recognized for his work and many years of service at Starke Pharmaceuticals.
Things get worse when one of the junior employees, Mark McKinney (PATRICK WARBURTON), cuts him off in the parking lot and then slaps him around in front of Natalie and his coworkers. When Joe doesn't return to work for several days, one of the executives, Jeremy (GREG GERMANN), sends the company's wellness coordinator, Meg Harper (JULIE BOWEN), to his home to find out what's wrong and get him to return to work without suing the company.
Realizing he must stand up for himself, Joe announces he's going to beat up Mark, a proclamation that suddenly makes him quite popular with his coworkers. The only problem is, Mark's a big guy, so Joe begins taking lessons from martial arts instructor and former "B" movie actor, Chuck Scarett (JIM BELUSHI), so that he has a fighting chance in their upcoming "rematch."
With just three weeks before the fight, and while enjoying his newfound popularity and fame, Joe tries to learn what he must to take on Mark, all while Callie and Natalie become disheartened with how Joe has changed.