Ernie Grunwald

Ross and Chandler trade barbed insults on their alma mater's Website; Phoebe's resolve not to call ex-boyfriend Mike (Paul Rudd) weakens.

When a convicted child molester turns up dead near CBI HQ, Lisbon finds herself at the centre of a murder investigation. Though initially insistent that she is not the killer, the agent begins to doubt her own innocence when she realises that she can remember nothing of the night in question.

Charlie has to come up with ways to keep his girlfriend's four-year-old son amused. Meanwhile, Alan becomes a test subject.

Derek's mother makes a surprise visit and meets Meredith for the first time; Mark tries to hide his relationship with Lexie; Cristina and Owen try to go on their first date.

Three days before Christmas the body of a bearded man in a tailor-made Santa outfit turns up in a sewer; Brennan visits her father in prison and plots a nontraditional holiday reunion.

When the pair take temporary office jobs, Caroline is keen to climb the corporate ladder and Max is hit on by the boss.