One night, Nyssa could not sleep. The TARDIS was colder than usual and she hears a scream for help and a crash ... The TARDIS dissolves around her and she finds herself stranded on a cold, ice Planet where the crash happened. During exploration Nyssa injures herself, but is thankfully rescued by Commander Metzer - who is young, handsome and kind, he has a score of men with him, some seriously injured - Commander Metzer's brother in law, Dr Johann Schmidt, has tried to console Commander Metzer through his tragedy ... One that Nyssa can heal - but is worse to come? Nyssa has to rely on her wits to survive as one of only two women: The second one is a cheeky brunette called Clara Oswald, amongst a lot of men - and Commander Metzer has to learn to allow his heart to care again ... Though what sinister force is behind this sudden unexpected meeting, and will The Doctor be able to find Nyssa before it is too late?