Ep 6. The Age of Steel

In Doctor Who (2005) season 2 episode 7, titled "The Age of Steel," the Doctor and his companion Rose Tyler find themselves in an alternate universe, where the world is controlled by parallel versions of her dead father, Pete, and her mother, Jackie, who is now a cyborg.

The story picks up from the previous episode, "Rise of the Cybermen," where the Doctor and Rose landed on a parallel Earth where history had taken a different path. In this universe, a company called Cybus Industries had developed a way to convert humans into "Cybermen," metal beings with no emotion or thought. The company had even created a parallel version of the Doctor’s old enemy, the Cybermen.

In this episode, the Cybermen have taken control of London and are converting people into Cybermen. The Doctor and Rose are trying to find a way to stop them and save the parallel universe from destruction. They team up with a group of humans, including a resistance leader named Ricky (who is an alternate version of Mickey, Rose's ex-boyfriend from their universe), and Jake, another member of the resistance.

As they make their way through the city, the Doctor and his companions encounter many Cybermen and people who have been converted. They also learn more about the plan of Cybus Industries, which is to convert as many humans as possible and then use them to spread the new "Cyber-race" across the universe.

Throughout the episode, the Doctor and Rose fight to stay alive and find a way to stop the Cybermen. They face many obstacles, including being captured by the Cybermen and infiltrating the Cybus Industries base to try and stop the conversion process.

Eventually, the Doctor and his companions come up with a plan to stop the Cybermen and save the parallel universe. They work together to execute the plan, which requires them to sacrifice some of their own safety to succeed.

Overall, "The Age of Steel" is a thrilling and action-packed episode that shows the Doctor and his companions facing off against a powerful enemy. It also explores the consequences of tampering with alternate universes and the dangers of technology turning against those who created it. With exciting action sequences, interesting characters, and a compelling plot, this episode is sure to keep fans on the edge of their seats.