The roommates say goodbye to another summer at the Jersey Shore.

Snooki and Vinny have a falling out; Mike continues to instigate drama between Sammi and Ronnie; Pauly and Vinny try to hook up with Deena’s friend, which doesn’t go over well with Deena.

Things heat up between J-Woww and Roger; Pauly and Vinny take a road trip to Staten Island; Mike clues Ronnie in on some of Sammi’s suspicious behavior.

Sammi returns to the house; Snooki’s feelings for Vinny deepen; Mike believes a hook-up smells like cheese.

Snooki’s hook-ups haunt her; Mike pranks Deena and Snooki; the guys ditch Mike.

Ronnie is an emotional wreck following Sammi’s departure, and when the girls take her side, Ronnie feels like he has no friends left in the house. Ronnie thinks about leaving the house.

Ronnie and Sam end their tumultuous relationship with a nasty breakup that prompts Ronnie to destroy all of Sam’s belongings. Later, she considers leaving the shore for good.

Ronnie’s drinking has consequences; Snooki meets a new guy; Pauly makes peace with an old nemesis.

Ronnie and J-Woww make amends, which sends Sammi over the edge. Meanwhile, Mike uncovers Deena’s dirty little secret; and Vinny goes out with a girl who has an overbearing family.

Snooki is released from jail; Deena meets a Ronnie look-alike; and J-Woww breaks up with her beau.