The Doctor has retired to 1892 London. Despite the protests of his allies, he is determined to keep out of mankind's affairs. However, a governess named Clara has stumbled upon a plot which only the Doctor can unravel, involving the death of her predecessor in ice and the sinister Dr. Simeon, who controls monsters made of sentient snow. And there is another mystery afoot: Clara is the spitting image of Oswin Oswald, whom the Doctor saw die in the Dalek asylum...

The first series of Life On Mars focuses on Sam's life following the crash and his arrival in 1973. Elements are thrown in to suggest he is mad, in a coma, or travelled back in time. Also during the first series run, Sam is informed that he is DI (Detective Inspector) to DCI Gene Hunt and the rest of the CID department in Manchester in 1973. This revelation is something that Sam finds hard to understand; he spends most of the series working alone, against his team and Gene.