Milton meets the president of a powerful brotherhood who plans to steal an original "Star Wars" lightsaber. Meanwhile, Kim visits Jack in Seaford, and he dreams he is a Jedi rescuing her from dark forces trying to take her away.
As a lunar eclipse approaches, Jack's disbelief in ghosts is put to the test when a legend resurfaces about a ghost pirate returning to seek revenge on the wharf after a lunar eclipse 300 years ago led to his ship crashing into the shore.
Jack and Milton take a road trip to bond and stop bickering. Meanwhile, Jerry and Joan buy a storage locker where they discover a famous piece of sports memorabilia that appears to bring them good luck.
Milton borrows his dad's pristine classic convertible to attend a senior party in style. Meanwhile, Rudy and Jack recruit a new group of bodybuilders to train at the gym, but problems arise when they disregard the code of conduct.
Milton, Jerry and Joan create their own stylized martial-arts video and it lands them a gig performing at the Cactus Festival. Meanwhile, Jack and Rudy invite their rock-star friend Izzy to his first baseball game.
Season 4 begins with Jack and Milton returning to Seaford after three months in Washington, D.C., and learning that Rudy has opened a dojo in a new mall and that Phil has opened a bowling alley where Jerry works. Suddenly, Jack and Milton get an urgent message from Funderburk requesting their help one last time back in the nation's capital.