Classic Doctor Who Season 21 Episode 4 Warriors of the Deep: Part 4

The episode "Warriors of the Deep: Part 4" is the fourth part of a four-part serial from the 21st season of the classic British science fiction show Doctor Who. The episode originally aired on February 16, 1984 and was written by Johnny Byrne and directed by Pennant Roberts.

The story takes place in the distant future, in the year 2084. The Doctor (played by Peter Davison), along with his companions Tegan (Janet Fielding) and Turlough (Mark Strickson), has arrived on an underwater military base off the coast of England. The base is meant to prevent an all-out war between the Earth and a race of intelligent reptiles known as the Silurians, who are also underwater. However, unknown to the humans on board, a third party is involved- the Sea Devils, another aquatic race that has a long-standing alliance with the Silurians.

In the previous episode, tensions between the humans and the Silurians had boiled over into violence, and the Doctor found himself trying to stop a full-scale war from breaking out. He had discovered that the Silurians had been infected with a deadly virus, which was causing them to go insane and attack the humans. Meanwhile, the Sea Devils had seized control of a nuclear missile on board the base and were threatening to launch it if the humans didn't agree to a truce.

As this episode begins, the Doctor is racing against time to find a cure for the virus before it's too late. He enlists the help of one of the Silurians, who agrees to help him if he promises to spare her people. Tegan and Turlough are also on a mission of their own, trying to find and disarm the Sea Devil's nuclear weapon. They're aided in their quest by a group of rebellious crew members who have turned against their commanding officer, who they believe is willing to sacrifice them all in the name of diplomacy.

The tension builds as the clock ticks down to a showdown between the three races. The Doctor must use all of his diplomacy and ingenuity to try to broker a peace deal, while Tegan and Turlough face danger at every turn in their quest to disarm the missile. The stakes are high, and the fate of the Earth hangs in the balance.

Overall, "Warriors of the Deep: Part 4" is an action-packed episode that brings the tense story arc to a satisfying conclusion. The underwater setting adds an extra layer of danger and intrigue, while the conflict between the three races raises some thought-provoking questions about the nature of war and diplomacy. Fans of classic Doctor Who will enjoy the return of the Silurians, as well as the introduction of the Sea Devils, who have since become a beloved part of the Doctor Who mythology.