Ep 3. Terror of the Zygons: Part 3

The Third Doctor and UNIT continue their investigations in Scotland, trying to find the cause of the mysterious disappearances and localised earthquakes that have been plaguing the area. Meanwhile, Sarah Jane Smith has been captured by the Zygons and held aboard their spaceship.

As the Doctor and UNIT close in on the location of the Zygon base, they discover that the aliens have a far more sinister plan in store than merely taking over a few isolated villages. The Doctor's old enemy, the renegade Time Lord known as the Master, is also on the scene, and it soon becomes clear that the two adversaries will have to work together if they are to stop the Zygons from unleashing a catastrophic attack.

With the help of Sarah Jane and the indomitable Brigadier Lethbridge-Stewart, the Doctor and the Master must race against time to prevent the Zygons from detonating a device that will destroy all life on Earth. But as the tension mounts and loyalties are tested, it remains to be seen whether the Doctor and his allies can overcome their differences and save the day.

Featuring stunning location filming in Scotland and some of the most memorable monsters in the Doctor Who canon, "Terror of the Zygons: Part 3" is a classic slice of 1970s sci-fi adventure. With top-notch performances from Tom Baker, Jon Pertwee, and Nicholas Courtney, this gripping episode is sure to keep viewers on the edge of their seats until the very end.