Ep 5. The Silurians, Episode 4

The Doctor Who Sampler features the Third Doctor, played by Jon Pertwee, in season 1, episode 5, titled The Silurians, Episode 4. In this episode, the Doctor continues his investigation into the Silurians, a race of reptilian humanoids who lived on Earth millions of years ago and who have now awakened from hibernation. Alongside his companions, Liz Shaw and Brigadier Lethbridge-Stewart, the Doctor tries to establish communication between humans and Silurians, in an attempt to avoid a violent confrontation.

The episode starts with the Doctor and Liz discovering a lab where a new anti-bacterial agent is being developed. The Doctor recognizes the technology and equipment from the Silurians' base, and suspects that some Silurians may have infiltrated the facility and stolen the agent. Meanwhile, the Brigadier finds out that his troops have engaged in a battle with some Silurians near a nearby quarry.

The Doctor and Liz decide to investigate the quarry and find that there is a Silurian base underneath it. They are captured by the Silurians, who reveal that they have been observing humans and that they plan to reclaim the Earth from them. The Doctor tries to reason with the Silurians, arguing that humans and Silurians can coexist on the planet. However, the Silurians, led by their leader, reject the Doctor's proposal and continue to prepare for war.

As tensions rise between humans and Silurians, the Doctor realizes that he needs to find a way to stop the conflict before it is too late. He decides to host a conference with both human and Silurian representatives, in an attempt to reach a peaceful solution. The conference is held in the Silurian base, and tensions are high as both sides express their grievances and concerns. However, the Doctor manages to find a middle ground, proposing a truce and a shared territory for both species.

The episode ends with the humans and Silurians agreeing to the truce, and the Doctor hoping that this will pave the way for a peaceful coexistence between the two species. The Silurians, Episode 4, is a thrilling and thought-provoking episode, showcasing the Doctor's diplomatic skills as he tries to prevent a war between humans and Silurians.