Kathe E. Mazur

A young boy needs a heart transplant but doesn't seem to want it, and his treatment causes Burke and Yang to have philosophical differences. Meanwhile, when the interns rally to help Alex prepare to re-take his exam, Meredith has to remind Izzie of the true spirit of the Christmas holiday; and despite a reconciliation with his wife, Derek isn't in a festive mood.

Lisbon takes another look at the murky world of billionaire businessman Tommy Volker, as well as helping Jane to catch the killer of an up-and-coming model.

Frasier vows revenge after Bulldog plays a prank on him, and Daphne's mum wages war against a scorned trick-or-treater in a practical joke grudge match.

Addison falls for a colleague at St Ambrose. Elsewhere, Pete and Sheldon convince Violet to take a pregnancy test.

The treatment of a teenage boy with partial paralysis uncovers a disturbing family secret, while House looks for a creative way to remove his ankle monitor.

When the son of a Russian diplomat turns up murdered, Beckett and Castle find themselves in a game of international crime and punishment, with Castle having to entertain a Russian security officer who ends up more involved than anyone planned.