Michael Leydon Campbell

House and the team encounter a teenager who collapsed during her high school Christmas program. They soon find the troubled teen dealt with more than her share of bullying at school, and as her condition continues to deteriorate, the team must delve deeper to get to the bottom of her mysterious illness. Foreman continues to work with Thirteen on the Huntington's disease drug trial, and their relationship progresses when he learns a valuable lesson from her. House gives a clinic patient an unbelievable holiday gift and keeps the team guessing about who may have sent him a particularly thoughtful Christmas present. Meanwhile, Cuddy receives an unexpected gift of her own.

Shirley asks Alan Shore to use his odious lawyering to help her defend a police officer accused of torture. Donny Crane returns and is the opposing counsel in Denny's case, with Chelina Hall as second chair, where a woman wants to sue her former boyfriend for saying no to her at the alter.

The detectives investigate the death of a phone-sex operator and the kidnapping of a wealthy man's son; and Clark's tryst with a murder suspect is used to derail the prosecutor's case.

In the midst of Billy's trial prep, Isaiah and Sadie visit her mother, Carolyn, in prison after they learn important information regarding her former accomplice. Also, Cameron and Albert defend a transwoman arrested for stabbing a famous baseball player, and Cameron finally gives into her feelings for Peter. Judith Light, Ben Lawson guest star.