Ian Vogt

The BAU team is following a serial killer who has discovered the Internet as a hunting ground for himself and has given the expression 'social networking' a completely new meaning.

A man who believed he had been abducted by aliens is found murdered. The hunt for his killer is hampered when the man's corpse disappears from the coroner's van.

JD takes Carla out for a drink to persuade her to move back in with Turk, but things don't quite go to plan and the pair ends up sharing a `friendly' kiss. Meanwhile, Elliot and Dr Kelso struggle to remain professional when faced with a delicate patient issue, and Dr Cox tries to be a cool dad.

As Emily sifts through the wreckage of her life, even her closest friends worry she has finally gone too far.

When a therapist vanishes, the team suspects that one of her former patients, whose identity is unknown, may have been involved.

The doctors investigate when Abbott's father is implicated in a murder that took place 30 years ago, and Andy clashes with the piano teacher over what is best for Ephram.