The universe is at war. Action takes courage. The TARDIS is ensnared in a time corridor, catapulting it into derelict docklands on 20th century Earth. The Doctor and his companions, Tegan and Turlough, stumble on a warehouse harbouring fugitives from the future at the far end of the corridor - and are soon under attack from a Dalek assault force. The Doctor's oldest enemies have set in motion an intricate and sinister plot to resurrect...