Warriors of the Deep: Part 4

Warriors of the Deep: Part 4

Available on BritBox, Prime Video
S21 E4: The Silurians now have total control of Sea Base 4 and its proton missiles. They intend to trigger a full scale war on Earth that will wipe out the human race. The Doctor tries to find a solution that will save both the humans and the Silurians, but he is eventually forced to make a very difficult choice.