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Ronnie is shocked to see Sammi return. At the club, he tries to get back on her good side but she gives him the cold shoulder for now. Snooki tells Sam that she has feelings for Vinny but is heartbroken when she finds him “smushing” a girl he brought home from the club. The gang goes out bowling and realize Deena is a bad driver and Sammi and Jenni try to get Vinny to talk to Snooki about her feelings and their relationship. Then the roommates finally cannot stand the clogged toilet and decide to call a plumber who finds a tank top in the toilet. Ronnie, Sam, and Snooki play a prank on Mike by covering his bed with grated cheese that makes him believe the girl he brought home has a yeast infection and Vinny and Snooki finally talk about their relationship.

Snooki realizes thanks to Jenni that her previous hookups are actually related. Ronnie contimplates again on leaving until his dad makes him realize wherever he goes, he will continue to feel crappy. Mike being annoyed by Snooki and Deena to the point where he sets up a prank that sends the duo to Times Square. After pulling off the best prank yet, he gets left behind by the boys after taking a long time getting ready. The girls return and make Mike feel as if his prank didn’t work. In the end, the group gets ready to go out until Sammi makes her return to the shore.

After Sammi leaves the house, Ronnie is an emotional wreck. With the girls taking Sammi’s side and the guys not knowing how to cheer him up, Ronnie feels like he has no friends left in the house. Meanwhile, The Situation tries to hook up with Pauly D’s ex-girlfriend.

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 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.