Ep 4. Robot, Episode 3

The Doctor Who Sampler: The Fourth Doctor season 1 episode 4 features the third episode titled "Robot." Set in the year 1980, the episode begins with a group of scientists at the Think Tank facility who are working on a top-secret project that involves developing a sophisticated robot called K1. However, things quickly spiral out of control when one of the scientists, Professor Kettlewell, is kidnapped by a mysterious group that is after the robot.

Soon after, the Doctor and his companions, Sarah Jane and Harry, arrive at the facility, having tracked the energy source that powers K1. The Doctor is immediately suspicious of the whole operation, especially when he finds out that Kettlewell had been abducted. He begins to investigate, and discovers that the robot, which Kettlewell had designed to be a tool for peacekeeping, has been reprogrammed to serve a secret faction with a different agenda.

As the Doctor and his companions try to unravel the mystery, they find themselves up against the robot, which has grown significantly in size due to its advanced programming. The robot is now a formidable force that will stop at nothing to carry out its mission, which is to destroy all life on Earth.

In a race against time, the Doctor and his companions must find a way to thwart the plans of the sinister group that controls K1 and ensure that the robot doesn't carry out its deadly mission. They face many challenges along the way, and the end of the episode is a thrilling, action-packed showdown that will keep viewers on the edge of their seats.

Overall, "Robot" is a classic Doctor Who episode that showcases the show's signature blend of action, suspense, and humor. It's a great introduction to the Fourth Doctor, who is played with charm and aplomb by Tom Baker, and it offers plenty of twists and turns to keep viewers engaged. With its innovative plot, strong performances, and impressive special effects, "Robot" is a must-watch for Doctor Who fans and newcomers alike.