The guys play detective and try to solve Ghost Princess' murder.

The team treats an underage and homeless female patient, but when her symptoms worsen and call for an invasive surgery requiring adult consent, House and Adams argue over whether they should contact social services. The patient confesses that she ran away from home after struggling to take care of her mother, a recovering drug addict.

The much-anticipated 100th episode will open with a musical dream sequence featuring Serena, Blair and all the men in their lives. Also, while Chuck wrestles with the reality that Blair is about to walk down the aisle with Prince Louis, the return of Georgina Sparks might make the royal affair a royal disaster.

After putting her foot down about Caleb with her friends, Hanna begins to feel that she is getting the cold shoulder from them. Aria, Emily and Spencer seem to be up to something, but she can't quite seem to figure out what it is.

Ben visits Puerto Rico with the 11 remaining women. Nine of them "play ball!" at Roberto Clemente Stadium in Carolina (the Hall of Famer's hometown), and one gal has Ben to herself for a tour of Old San Juan, where they happen upon a wedding. Another bachelorette goes yachting with Ben. But when he returns to his hotel, he's surprised by another gal, who taunts the others about it at the rose ceremony. Then Ben and nine women head to Panama.

Pops bars Benson from yelling at Mordecai and Rigby, causing Benson to have a major meltdown.

Amaar needs Baber and Thorne's cooperation to win a coveted Multi-Faith Award, but Baber and Thorne try to cut Amaar out when they discover the award comes with a cash prize. Meanwhile, Ann sets Sarah up on the worst first-date of her life, which leads to the worst second-date of her life. And Nate and Fatima team up to make a multi-ethnic sandwich.

Frank scouts for classic motorcycles. Meanwhile, a prolific collector is eager to sell; Frank revs up for a high-school reunion; Mike and Danielle happen upon a vintage and possibly pricey guitar.

Aidan goes on a date with a human while he is cut off from his blood supply; Sally delves into reincarnation; Josh and Nora get ready for their second change together.

Ethan insists on helping Emma get the answers she's looking for about her twin sister. So when a tattoo sparks a memory about Sutton, Ethan pursues an explanation. But the information proves costly when Ethan heads into a situation that quickly gets out of control.

Zoe is so uncharacteristically happy as of late that it causes her friends to speculate as to the possible reason behind her new attitude. Turns out that Zoe is hiding her new friendship with AnnaBeth, who doesn't want Lemon to find out since Zoe is Lemon's sworn enemy.

When Cal Sweeney, a bank robbing criminal, returns from the past and things go wrong in the present, Rebecca has to break him out of the hostage-filled bank before people can find out who he is.

Episode Detail: RuPocalypse Now! - RuPaul's Drag Race Season 4 premiere: Thirteen new queens begin their quests for the title of 'America's Next Drag Superstar,' but first must survive drag zombies and the end of the world. Elvira, Mistress of the Dark, is the guest judge on the opener.

It's exam time at Xavier Academy and Gerry is convinced that he will catch a few students who are known to cheat on their exams.

An 1830s musket purportedly made by inventor Eli Whitney; a golf ball once owned by Lyndon B. Johnson; a 1929 Chicago Cubs World Series press pin.

A rock poster from one of Jimi Hendrix's final performances; an autographed Paul Newman racing suit; a photo signed by baseball legends Mickey Mantle, Willie Mays and Harmon Killebrew.

Lou Dobbs

Maya Rudolph, Chris Gethard, Dale Earnhardt Jr.

Laurence H. Tribe

Jennifer Lopez, Rob Schneider, James McCartney

Madonna, Chris Colfer, Joe Perry

Don Cheadle, Andrea Riseborough

After putting the finishing touches on his plan, Tsukishima activates the Fullbring he placed on Ichigo's friends and family in order to make them believe that Tsukishima is a close relative of the Kurosaki family. Kugo also has problems of his own as the other members of Xcution have fallen under Tsukishima's control.

Greg tries to keep away from Sahira, but is upset when she reveals she is leaving Holby.

Gemma finds her perfect life coming to an end after armed police raid her house and arrest her husband Steve on suspicion of murder. Gemma finds it hard to to make sense of the bewildering judicial system, but believes in her husband's innocence.

Somebody from Jamie's past arrives on the estate, looking for a favour to be returned. D.S. Brooks, is currently suspended pending some serious charges and Jamie doesn't know if he can go through with what he wants and the safety of his family ends up being in the balance. Aidan skips school after he is haunted with nightmares about his doing nothing to stop Frasier attacking his school teacher. After Frasier turns his attention to Letitia, Aidan ends up feeling like he has no choice but to act. Micky has to deal with a life-changing decision after a debt collection goes badly wrong.