Season 4

Jack and Milton return to Seaford and discover that Rudy has opened an impressive two-story dojo in a new mall and Phil has opened a bowling alley, and Jerry is the new manager. While Jerry faces Rudy in a bowling match after making Phil's customers go away, Jack and Milton return to Washington D.C. to stop Shane, who is revealed to be a double agent.

Jack, Milton and Rudy discover a gold mine on Rudy's inherited seemingly worthless piece of land, But fight on who gets most of the gold. Meanwhile, Jerry helps Phil achieve the dreams he've always wanted.

Milton, Jerry and Joan create their own highly-stylized martial arts video. Jack and Rudy take Izzy to a baseball game, but it becomes chaotic when fans try to chase him when Izzy causes Seaford to lose the chance of becoming World Champion.

Milton and Jerry volunteer at the Seaford History Museum in an attempt to win over the same girl but when they discover the museum is being robbed and the girl of their dreams is in danger, they have to work to save her and the museum.

Jack, Miltion, and Jerry team up to compete in a Commando Paintball Challenge, but Jack can't whip the guys into shape. When he gets an invitation to join the reigning champs from the South-hold Military Academy, he jumps at the opportunity. Meanwhile, Rudy helps Phil get over his fear of dentists.

When Jerry quits his job at the bowling alley, he joins Joan as a mall cop, but the two are faced with the unexpected when the mayor's son is captive. Meanwhile, Jack and Milton have a speed walking race at the park.

Milton fears his dreams of going to Oxbridge University are ruined until he meets Tom, the president of a powerful brotherhood that can help him. Meanwhile, Jack is mad at Jerry for ignoring a call from Kim that he was expecting.

A documentary crew comes to film the dojo for a day, and Rudy takes advantage to make himself look good. Jack, angry that Rudy won't give him the sensei test, retaliates by convincing Rudy's grandmaster to fake being a fraud, demoting Rudy back to white belt. But Jack discovers that running the dojo is hard work. Meanwhile, after Jerry pranks him one time too many, Milton goes too far with pranks, not only on Jerry, but on the camera crew as well.

The gang accidentally infest a boys' club with termites, and need to raise $13,000 in order to pay to have the club fixed.

When Jerry disrespects Jack’s authority as a sensei and throws an unauthorized party at the dojo, Jack suspends him from taking his black belt test.

Kim returns from Japan with her sensei, Tomo, who’s interested in hiring Rudy for a position at the prestigious Otai.