The anonymous letter leads to friction among the ladies, culminating in a full-blown fight. Also: Snooki spends another night in bed with Vinny

Leela leads an army of underground mutants in a rebellion against the surface people.

Andy and Sam look for proof that Andy’s dad didn’t committ a murder while he was blacked out from drinking. A masked vigilante steals Chris and Dov’s squad car which in turn unintentionally helps a drug dealer.

Another houseguest is evicted from the compound and the Head of Household competition is held.

The chefs must come up with tasty space food creations.

Five winning acts advance to the Top 10

Shawn meets his match in a talented criminal profiler while investigating a series of murders targeting donors on a liver-transplant lis

Jaimie poses as a junkie in order to infiltrate a dangerous crew of thieves who pose as DEA agents in order to steal from drug dealers. As Carter grows concerned about Jaimie’s eagerness to make the case, Ty and Dean are stuck with a loveable yet annoying informant who wants nothing more than to be [...]

Episode Synopsis: The semifinal round continues with 12 acts performing.

The Power of Veto competition is held.

Louie explores religion.

Tommy and Sheila do their best to adjust to life after Damian’s accident. Sheila copes with her grief, Tommy struggles to budget his time, and the guys find themselves with a new pickup ploy.

After Annie witnesses a suspicious purchase at an art auction, her follow-up brings a surprise visitor — Ben Mercer — back into her life.

The head researcher of a tech company is murdered, and Peter and Neal take on the case. Though the company’s CEO claims the killing was the work of a competitor, evidence points to someone within the company

World Team tryouts have finally arrived, and The Rock girls have to fight for spots on the team.

The team seeks a murderer in Russia who is using artifacts from Artie’s past to kill, but H.G.’s offer to help complicates matters. Meanwhile, Claudia snoops into Todd’s past and uncovers some disturbing information

It’s ladies night, and 24 women face obstacles including Plank in the Face, Beauty Bar and Trampoline Sweeper.

While Mel is unhappy that Lennox’s new beau is a bad boy, she has no problem dating a guy with a similar reputation.

Part 1 of a two-part reunion edition features reassembled Jersey girls Teresa, Caroline, Jacqueline and Danielle dissing and dishing about Season 2′s panorama of mama dramas.

The contestants don swimwear and frolic on a makeshift beach in the darkroom.

Cathy’s efforts to connect with those closest to her hit a snag, so she reluctantly signs up for a cancer support group. Elsewhere, Paul makes an elaborate romantic gesture in an attempt to win back his wife; Cathy throws a dinner party for Andrea, Sean and his new girlfriend; and Marlene unexpectedly becomes privy to [...]

Serial killer Charles Hoyt continues to haunt Jane’s past and present. The sinister slayer who once targeted Jane might be at it again when a body is discovered in a park. As Jane’s fear deepens, Maura tries to track the killer’s next move.