Broadcast: Tuesday 24th December 2013
8:00am-9:00am EST (13:00 GMT) < > « »
BBC America (adverts during broadcast)

Featuring: Matt Smith, Arthur Darvill, Karen Gillan, Hugh Bonneville, Lily Cole

The TARDIS is marooned onboard a 17th-century pirate ship whose crew is being attacked by a mysterious and beautiful sea creature. Becalmed and beset by cabin fever, the pirates have numerous superstitious explanations for the Siren's appearance.
Synopsis Source: BBC America website schedule listing