Onboard a sailing ship in the middle of the Battle of Trafalgar, the sailing crew explain to the Eleventh Doctor and Amy Pond that they are on the run from a sea monster that came out of the fog, a giant metal beast (believed by the crew to be the Kraken). Tracking the infestation to the engine room, the Doctor reverses the neutron flow and the Time Roaches are sent back into the Vortex. The Doctor leaves the carrier with little time to spare before it goes back to its own time. He returns to collect Amy, who has made friends with some of the sailors aboard the ship.