Rachel Melvin

The past comes back to haunt Madison when Ian Buchanan joins the cast as a former foil.

A teenage military trainee at a juvenile offender training camp suffers peculiar symptoms after enduring an intense training course, and mysteriously, his drill sergeant is soon admitted for similar symptoms. Unable to track down the cause of the shared illness, the team searches for clues in the trainee's family medical history, and Masters (guest star Tamblyn) and House reveal a unique bond between the sergeant and trainee. Meanwhile, when an indecent photo of Chase is posted on a social-networking site following three different romantic encounters, Chase is determined to find out which girl is trying to publicly disgrace him. Also, sensing Cuddy's stress over her daughter Rachel's enrollment at a prestigious preschool, House secretly prepares Rachel for observations and reveals a soft spot for the toddler. Also available on iTunes

Sylar digs himself out of the dirt, alerting Samuel to his impending arrival. Ernie Hudson guest stars. Also available on Amazon Instant Video and iTunes

The ringmaster of a very special carnival seeks revenge for the death of his brother; Tracy resurrects, hell bent on revenge; Claire starts college; Sylar's personality threatens to disrupt Nathan's life, while wreaking havoc in Matt's mind. Also available on iTunes