The Doctor and Ace are put to the ultimate test when the TARDIS materializes in Second World War England at a top-secret naval base. The army church, built on Viking graves, bears inscriptions calling for the wolves of Fenric to return for their treasure. Thereafter, evil will reign. Even as the Doctor translates the inscription, hideous corpses rise up from the sea, and the evil Fenric is now free to summon his wolves to a killing rampage.