It is Christmas Day on a remote human colony, and the Doctor is hiding from Christmas carols and comedy antlers. But when a crashed spaceship calls upon the Doctor for help, he finds himself recruited into River Song's squad and hurled into a fast and frantic chase across the galaxy. King Hydroflax is furious, and his giant robot bodyguard is out of control and coming for them all! Will Nardole survive? And when will River Song work out who the Doctor is?