Heartbroken runner up of The Bachelor DeAnna Pappas will have her own chance at love as 25 bachelors arrive to vie for her affections. Ten will be released before the episode ends.

The Gormogon serial killer is back again, and the silver skeleton from the basement vault has gone missing. All the Jeffersonian employees become suspects, with the scary possibility that one of their own is working with Gormogon.

In the aftermath of the bus accident, House struggles with his head injuries and short-term memory loss, and must remember the symptom he saw before one of their own, who was on the bus with House, dies.

Blair takes matters into her own hands to help Serena with the manipulative and evil Georgina Sparks. Lily, while keeping Rufus in her mind, prepares for her wedding with Bart Bass that is designed to be the Upper East Side's social event of the year. Serena finally tells Dan the whole truth about her past and they try to work things out after Dan has cheated on her, but will it be too late? An unexpected guest shows up at Lily and Bart's wedding. Georgina is sent somewhere where she can do no harm. Blair plans to go somewhere with Chuck.

Penny's break-up spurs Leonard to summon the courage to ask her out, and each goes to Sheldon for advice on their upcoming date.

The final round of competition finds Kristi, Jason and Cristian dancing the cha-cha in quick sensation along with their partners. Tonight will also feature a freestyle round, and the junior champion will be chosen.

Ted is in a car accident that prompts Marshall to talk about miracles. Everyone flashbacks to prior moments in their lives.

The Tree Hill residents are forced to face their fears as Dan turns over on a new leaf and Brooke makes the hardest decision of her life. In the meantime, Haley's career takes a turn and Peyton is visited by somebody from her past. Lucas is still struggling to mend his heart after Lindsey left him at the alter. Meanwhile, Mouth and Millicent meet a new face.

When Charlie meets the fiancée of Angie's grown-up son, he realizes it's not for the first time. Alan tries to get Jake to study for his algebra final.

Trouble is caused by Casey when she bends the sorority house rules for Ashleigh. Cappie tries to get rid of restrictions.

Meanwhile, Rusty finds himself attracted to Tina, the girl who wants to take down the Greek system.

Kris and Junior are offered a chance to work on a geothermal project for a year, which would mean a relocation in Alaska. Meanwhile, Kris finds out she is to race in the Tucker Stakes on Wildfire, one last time.

Mike gets dirty in Alaska as he helps protect the environment by cleaning up an oil spill. He then travels to Minnesota where he works to pull a car out of a lake that has fallen through the ice.

Russell tries another approach to get the girl. Will using his apartment for a photo shoot seal the deal? Also Adam and Jennifer have a wedding date picked.

Paige's new high fashion job conflicts with Alex's lack thereof, leaving Paige to wonder if Alex was better off as a stripper. Manny and Damien try to work out their relationship now that they are classmates.

As the first new medical examiner they have is shot, the CSIs learn the streets of Miami got more dangerous. Horatio must keep his team alive and restore order to his son's life. The clock runs out when one of their own is gunned down.

Kyla learns that Abra is back from Africa and has to face some of her demons. Faye has to make some tough decisions about her relationship with Joseph.