Classic Doctor Who Season 20 Episode 9 Mawdryn Undead: Part 1

The Classic Doctor Who season 20 episode 9, titled "Mawdryn Undead: Part 1," introduces viewers to the TARDIS, a time machine that can travel anywhere in time and space. The Doctor, played by Peter Davison, is traveling through space when he stumbles upon a mysterious spaceship. When the Doctor lands the TARDIS on the ship, he discovers that the crew aboard the ship are from his own planet, Gallifrey.

The crew members are a group of Time Lords who are attempting to cheat death by stealing regeneration energy from the Doctor. They believe that by doing so, they will be able to avoid the Time Lord's rule that they can only regenerate a certain number of times.

Meanwhile, a group of schoolboys accidentally stumble upon the spaceship and are affected by the radiation emanating from it. They begin to age backwards, but not without consequences.

As the Doctor attempts to thwart the Time Lords' plans, he enlists the help of an old ally, Brigadier Lethbridge-Stewart. However, things become complicated when the Doctor encounters one of the Time Lords, Mawdryn, who is immortal and has been seeking death for centuries.

The episode is full of action and suspense as the Doctor and his companions navigate the dangerous situation with the Time Lords and attempt to reverse the damage done to the schoolboys. With strong performances from the cast and top-notch special effects, "Mawdryn Undead: Part 1" is an excellent addition to the Classic Doctor Who series.