The gang tries to break up Barney and Quinn after learning they plan on moving in together, leaving Robin and Ted to fight over who deserves to sublet her apartment.

Maria Menounos & Derek Hough, Jack Wagner & Anna Trebunskaya, Donald Driver & Peta Murgatroyd, Gavin DeGraw & Karina Smirnoff, Roshon Fegan & Chelsie Hightower, Sherri Shepherd & Val Chmerkovskiy, Melissa Gilbert & Maksim Chmerkovskiy, William Levy & Cheryl Burke, Martina Navratilova & Tony Dovolani, Katherine Jenkins & Mark Ballas, Gladys Knight & Tristian MacManus, and Jaleel White & Kym Johnson take to the ballroom for the first time to do either the Cha-Cha-Cha or the Foxtrot.

Rosewood's Junior League Masquerade Gala is the perfect setting for "A's" next game of cat and mouse with his/her favorite targets. But with Aria, Emily, Hanna and Spencer fast on his/her heels, will this game be "A's" last?

The battles continue, while coaches ask music professionals Lionel Richie, Jewel, Alanis Morissette, Robin Thicke, Kenny Babyface Edmonds, Ne-Yo, Kelly Clarkson and Miranda Lambert for their help.

Max and Caroline take a spring getaway at a couple's posh apartment where they've been asked to dog-sit.

Alan and Lyndsey introduce their mothers to one another. Meanwhile, Jake and Eldridge enlist Walden to drive them to a high school party.

After her murderous rampage, Sally is trapped in a coma, so the boys turn to the ghost whisperer to save her. But when Sally's Reaper returns, they're the ones who need saving.

Rebecca, Doc and Hauser search for an unknown '63 who's returned more violent than before.

The guys team up with their best 'frenemies' for runway duets. Guests include Pamela Anderson and Jennifer Tilly.

As Ron and Amy make plans to renew their wedding vows, Bobby plans a wild bachelor party. A sneaky debtor leads Ron and Bobby on a wild goose chase. Bobby comes across a repo that could cause him to miss Ron and Amy's big day.

Gerry helps Bobbi supervise her Grade 5/6 field trip to the museum, while Jeff and Robert cover his classes back at Xavier.

When Peggy goes out of town, she leaves Jim with Mike and Molly in an effort to have them practice what having kids will be for them.

When Odette Morton, a contestant on the hit competition show "A Night of Dance," is found murdered in her dressing room, Castle and Beckett must navigate the case's many twists and twirls without stepping on each other's toes. But as they delve into Odette's past, they discover that this reality starlet was harboring a shocking secret that may have led to her death.

When McGarrett's sister is arrested for trying to smuggle $20 million worth of conflict diamonds, he and Chief Fryer reach out to August March, an ex-con who served 30 years for diamond smuggling, to help arrange a sting operation.

It's time for the team to present ''Marilyn the Musical'' to possible investors however, Ivy struggles to perform and Karen must make a difficult decision. Meanwhile, Julia and Michael must face up to the consequences of their actions.

Ewan McGregor, David Mizejewski, Dana Gould

Michelle Obama, Esperanza Spalding

Jamie Lee Curtis, Armie Hammer, Robert Glasper Experiment featuring Ledisi

Anne Rice, Geoff Tate

Ben and Emma are both nervously looking forward to their first date. When Carbo and Retta return from the honeymoon from hell, Ben and Emma head out to a restaurant and enjoy a perfect evening.

Ichigo and Uryu continue their battle with Kugo Ginjo. However, when Kugo senses that Tsukishima is close to dying, he decides to reveal to Ichigo the true meaning behind being a Substitute Soul Reaper.

When Elliot's plan to send disused surgical equipment to the Ukraine becomes public knowledge, he has to write a proposal for the hospital board. Will he be able to get Hanssen and the board onside before the valuable machines are taken off to be disposed of, whilst also finding time to treat one of his long-standing patients?

Surgeon Gabriel Weston takes a look at why so many people are gaining weight and finds out new ways to fight the fat.