Things quickly return to form as the cast returns to Seaside, NJ in the season premiere. Angelina's replacement, Deena, does a strip tease for The Situation and starts a brawl.
Tensions in the house continue to grow as Ronnie and Sammi continue to isolate themselves from the rest of the roommates.
Sammi decides to make up with Snooki and Deena. JWOWW runs into her old boyfriend Roger and sparks fly. Snooki runs into trouble and gets arrested for public intoxication.
After Snooki is arrested, she becomes miserable. That is until she meets a new guy. Deena meets Ronnie's stunt double. Meanwhile, JWOWW's relationship with Tom ends.
Sammi loses her cool when she suspects Ronnie of cheating on her again and catches him making nice with JWoww.
Ronnie's over-drinking causes some painful side effects. Snooki meets a guy who may or may not be engaged. And Pauly D makes peace with an old nemesis.
Ronnie and Sammi's tumultuous relationship comes to an end. When Ronnie destroys everything Sammi owns, she must decide whether or not to leave the shore.
With the girls upset that Ronnie's temper forced Sammi to flee the house, Ronnie feels alienated. The guys try to cheer him up, and The Situation makes a play for Pauley D's ex.
Snooki's summer of hookups comes back to trouble her. The Situation pulls a huge prank on Deena and Snooki. But the other guys have the final laugh when they ditch The Situation for taking his time getting ready for dinner.
Sammi's return to the shore house leaves Ronnie at a loss for words. Snooki's feelings for Vinny continue to deepen. The Situation hooks up with a girl who he's convinced smells like cheese but doesn't realize he's been pranked in a major way.
Vinny and Pauly D take a road trip to Staten Island. Roger becomes more than just a rebound for JWOWW. The Situation reveals Sammi's shady ways, causing Ronnie to question his love for her.
The Situation continues to instigate drama between Ronnie and Sammi, and Snooki has a falling out with Vinny.
The roommates say goodbye to another summer at the Jersey Shore. While one couple reaches a crossroads in their relationship, another couple makes it official.
The housemates reunite to talk about the hook-ups, break-ups and drama that filled their summer in Seaside.