Ep 1. The Mysterons

Captain Scarlet and the Mysterons is a classic British science fiction TV series that first aired in 1967 and ran for 32 episodes. The show follows the adventures of an elite security force called Spectrum, whose mission is to protect Earth from an alien race called the Mysterons. Each episode sees Spectrum facing a new challenge from the Mysterons, and Season 1 Episode 1, titled "The Mysterons", sets the stage for the rest of the series.

The episode begins with an intense battle on the planet Mars between a group of astronauts from Earth and the Mysterons, an alien race that has declared war on humanity. The astronauts are taken by surprise when the Mysterons attack their base with a powerful energy beam, destroying their equipment and killing all of them except for Captain Black. Black is possessed by the Mysterons and becomes their agent on Earth, tasked with carrying out their revenge against humanity.

Back on Earth, Spectrum is alerted to the threat posed by the Mysterons and begins preparing for an attack. Colonel White, the leader of Spectrum, is skeptical of the danger posed by the Mysterons and initially dismisses their threats as nothing more than propaganda. However, when Black begins carrying out attacks against high-value targets, including the President of the World Government, White realizes the seriousness of the situation and puts his full weight behind finding a way to stop the Mysterons.

Captain Scarlet, Spectrum's top agent, is chosen to lead the charge against the Mysterons. Scarlet has a unique ability that makes him the perfect candidate for taking on the alien threat - he can be killed and then brought back to life with a special "retro-metabolism" process. This means that he can be sent on missions that are too dangerous for normal humans, as he is effectively unkillable.

As the episode progresses, Scarlet and his team race to stop Black from carrying out the Mysterons' revenge. The Mysterons themselves are a mysterious and highly advanced race, with powers that seem almost supernatural. They can manipulate matter and energy at will, and their attacks are devastating. Scarlet and his team must use all of their skills and resources to prevent the Mysterons from succeeding in their plans.

Throughout the episode, there is a palpable sense of tension and danger, with the fate of the world hanging in the balance. The action is fast-paced and exciting, and the show's signature futuristic vehicles and gadgets are on full display. The characters are well-drawn and likable, with Scarlet in particular standing out as a strong and capable leader.

Overall, The Mysterons sets the stage for what would become a classic sci-fi series. The episode is a thrilling introduction to the world of Captain Scarlet and the Mysterons, and it quickly establishes the high stakes and intense action that would become the show's hallmark. Fans of classic sci-fi will find much to love here, and newcomers to the series will be drawn in by the compelling characters, high-tech gadgetry, and gripping plot.