The travellers arrive in Scotland in the aftermath of the Battle of Culloden. Taken prisoner by the Redcoats, the Doctor and Ben are to be sent to the West Indies as slaves.
Posing as a German physician, the Doctor manages to escape. But by the time he is able to return to rescue Ben and his friends, they have already been taken aboard the ship.
The Doctor is reunited with Polly and Kirsty and together the hatch a plan to rescue their friends from the Annabelle. Meanwhile, Ben is sentenced to walk the plank.
Exposing the traitors, the Doctor, Ben and Polly are taken safely back to the TARDIS, where they invite Jamie to join them…