Fed up with New York City after being mugged, Jack sets out to protect the safety of the city's elite by announcing his run for mayor. Meanwhile, Liz revels in sacrificing the good of the city to look out for her own interests, and Jenna and Paul are thrilled by the perversion of acting like a normal couple.

Another performance round finds judges Randy, Jennifer and Steven narrowing down the contestants even further in the Las Vegas Round.

When an office at the University opens up, Sheldon must compete for it with his archenemy, Kripke. Meanwhile, a gift from Amy makes Penny uncomfortable.

After starting her day with a startling discovery of Damon's latest indiscretion, Elena is frustrated to find that none of her friends agree with her on how they should react to the Original family's internal power struggle. Once again caught up in the destiny of the Bennett witches, Bonnie and Abby find themselves playing a part in a ritual to appease the spirits of nature. When Elijah gives Damon and Stefan a dangerous ultimatum that puts Elena in danger, they turn to Alaric and Meredith for help with a plan that leads them to a terrible choice.

While trying to get an endorsement from the Chief of Police, Leslie and Ben awkwardly run into Leslie's old flame, Dave. Meanwhile, Andy and the rest of the office work on a theme song for Leslie's campaign.

Maggie wants to start a family, but Rob doesn't want to have kids, so she and her parents try to change his mind. Meanwhile, Fernando shoots a commercial for his car wash.

In a final attempt to save Erica's life, Amelia arrives at Seattle Grace to beg Derek for help with the gliosarcoma case; Cristina and Owen engage in heated arguments during marriage counseling; Alex realizes that in order to be a good doctor, he'll need to improve his people skills; and Meredith is given a chance to shine when a man enters the ER after getting his hand stuck in meat grinder. Meanwhile, the residents continue to study for their upcoming oral boards.

Dwight finds himself fighting with his team for the attention of Sabre's Special Project's President. Back in Scranton, Andy is beleaguered with requests for raises.

Cassie is stunned when a notoriously evil figure from her past shows up on her doorstep. However, her surprise quickly turns to suspicion when he asks her to return the medallion she found in the wreckage of the fire that killed their parents. Cassie storms off but is captured by Eben and his band of witch hunters.

Reese goes undercover as part of a smuggling to track down the Machine's new Person of Interest, but soon realizes that he's dealing with an undercover cop. Meanwhile Fusco is forced to approach the crooked cops, his former associates, to help out Reese.

It's all about Broadway baby, when the designers compete for their Broadway debut. The award winning composer of "Wicked" Stephen Schwartz, challenges the All Stars to design an outfit for the Broadway musical "Godspell".

In Southern Louisiana the Gator Gold Rush is in full swing. Buyers are paying top dollar for alligators, and Troy has a plan to get his share. He's taking a special boat called a 'Gator Tail' to an old family honey hole. But when he encounters an unexpected obstacle, he risks it all to fill his boat. Junior Edwards and his son Willy are stalking an elusive beast known for his distinctive roar they call Leo The Lion. But Leo is a formidable adversary and it comes down to Leo, Willy and a pocketknife. Down at Pecan Island, Liz and her partner Kristie are taking a calculated risk of their own, hunting the canals from land to capture a monster that has been terrorizing the local population. R.J. and Jay Paul spy outsiders setting lines directly across from theirs, a direct violation of the code of the swamp. Things escalate quickly and the two-time world arm wrestling champion and his son don't hesitate to take matters into their own hands.

It's Reagan and Chris versus the airport when they travel with baby Amy for the first time. Ava agrees to be the minister for the wedding of her former band mate, Amanda, and past tensions come back to haunt them. Meanwhile, Kevin deals with Ava's feelings on marriage.

The guys look to create some more laughs as they pull pranks on each other and innocent bystanders.

Cooper and Charlotte take Erica to Seattle Grace to meet with Derek, Lexie and Amelia regarding a very risky surgery; Scott tells Violet that he would like to take their relationship to the next level; and Addison finds herself caught in the middle of Sam and Jake's fight about a patient. Meanwhile, Sheldon warns Sam to be cautious as he deals with the return of his sister, Corinne.

When a charity worker is killed, Jane has Erica Flynn, a murderer he helped imprison, furloughed in exchange for information she claims to have about the case. Meanwhile, Rigsby and Sarah try to adjust to impending parenthood.

Malory turns to Archer and Lana for help when she finds herself in a compromising situation with the Italian prime minister.

Snooki and Deena clash with one of the roommates; Roger visits and gets upset with J-Woww for wearing a revealing outfit.

Gary and Joel discover that they're in the slow track at school and stage a student uprising to abolish academic segregation.

Arne Duncan

Steve Martin, Cake

Jason and Tina plan a wild night out, hoping it will end their string of bad luck, but Stacey's bachelorette party and a needy drug dealer get in the way.

Joan Rivers, Andrew Lincoln

Amanda Seyfried, Billy Gardell, Monica, Brandy

Jeffrey Tambor, Amy Smart

The frenzied stabbing of a police forensic lab technician unsettles the team in a way they never expected when Detective Sam Casey falls for the killer's next intended victim.

Mickey beleives that he has found the ultimate mark in multi-millionaire businessman Madani Wasem. The stakes end up being much higher than usual as Wasem is extremely dangerous and the kind of mark they usually try to avoid dealing with.

Graham is joined on the show by Daniel Radcliffe, Omid Djalili and Sinead O'Connor.