Brendan Michael Coughlin

The team takes on the case of a man who collapsed while being mugged. When the man complains of new symptoms that do not fit his initial admission profile, the team suspects he is a hypochondriac. As Mr. X continues to fall ill with symptoms unrelated to his neurological disorder, Foreman and the remaining six fellows are assigned to keep watch, and are bemused as they see their own behavioral idiosyncrasies reflected through him. As they attempt to diagnose this human chameleon, they seem to learn more about themselves than their patient, whose true identity is a mystery. Meanwhile, Cameron and Chase keep a running pool on whom House might cut next from the team of candidates, and Foreman engages in a power struggle with House and Cuddy.

The doctors form two teams to operate on conjoined twins; Bailey uses Meredith as a buffer between her and Ben; Alex learns a tough lesson; Teddy asks Cristina about Henry's surgery.

The murder of a rare bookseller brings Jane and Maura into the world of Keltic writings and coded confessions, just as Maura is preparing Jane to meet her new man. Angela's relationship with Cavanaugh changes pace.

When an innocent man is brutally attacked and beaten to death by what looks like a monster in a black cape, the CSIs are called to investigate, only to learn that a similar attack took place minutes later. As the crime spree continues, the team follows the trail of evidence until Greg interrupts a beating in action and must make a difficult decision that could impact his life forever. Kevin Federline and Victoria Recano guest star. (TV-PG)

The Red Cell team must track down a suspect who is kidnapping young mothers. Meanwhile, Beth discovers why this particular case hits close to home for Mick.