Classic Doctor Who Season 20 Episode 12 Mawdryn Undead: Part 4

In Classic Doctor Who season 20 episode 12 titled "Mawdryn Undead: Part 4," The Doctor, Tegan, and Turlough remain stranded in the TARDIS after being hit by a massive energy release. The energy was emitted from the stolen Kalid artifact by the renegade Time Lord known as Mawdryn. The artifact possesses the ability to grant immortality and was stolen by Mawdryn in an effort to end his own eternal life.

As The Doctor and his companions try to figure out a way to escape their trapped state, Mawdryn's companions show signs of their own immortality in the form of physical decay and madness. The Doctor and his team also discover that Mawdryn and his companions' immortality is linked to their stolen piece of technology as well as the entity known as the Black Guardian - a powerful cosmic force of evil who wants the Kalid artifact for his own purposes.

As the story continues, The Doctor and his team must outsmart Mawdryn and the Black Guardian to save themselves and the entire universe from destruction. They quickly find themselves caught up in a complex web of events that involves time travel, a high-stakes heist, and a desperate battle for survival.

In this episode, viewers can expect to see the return of the Brigadier, a fan-favorite character from earlier seasons, as he once again teams up with The Doctor to save the day. Additionally, the episode features a surprise twist ending that is sure to leave viewers on the edge of their seats.

Overall, "Mawdryn Undead: Part 4" is a thrilling and action-packed episode of Classic Doctor Who that is sure to delight fans of the show. With its intricate plot, high-stakes action, and memorable characters, this episode is a standout in the series and a must-see for any Doctor Who fan.