Ep 11. The Sea Devils: Episode 3

The Doctor and Jo continue their investigation of the Sea Devils and their plan to awaken their ancient underwater cousins, the Silurians. They are able to confirm their suspicions that the Devils are using an old naval base as their headquarters by sneaking into the base disguised as naval personnel.

Meanwhile, the Sea Devils have captured the Master and are refusing to allow him to leave until he comes up with a plan to help them in their quest. Despite initially trying to manipulate them to his own ends, the Master soon realizes that the Devil's are too dangerous and must be stopped.

As tensions rise between the human and Sea Devil forces, the Doctor tries to negotiate a peaceful solution. However, this proves difficult as a rogue naval officer begins to take matters into his own hands and threatens to start a war with the Sea Devils.

The Doctor is able to convince the Sea Devil leader to meet with the human leaders and begin peace talks, but the negotiations are quickly broken down by the rogue officer who launches a missile at the Sea Devil base. The Doctor and his companions quickly spring into action, hoping to stop the destruction and prevent any further loss of life.

The episode culminates in an epic underwater battle between the Sea Devils, a group of courageous divers, and the human naval forces. At the same time, the Doctor races against time to stop the missile and prevent further destruction.

As the dust settles, the Doctor is finally able to broker a peace deal between the human and Sea Devil factions. However, the underlying tensions between the two groups remain, leaving the Doctor to wonder if their fragile peace will last.