The Doctor returns to Gallifrey to become the President of the high council of time lords. But Leela finds the Doctor is acting out of character and she is proved correct, when it is revealed that the Doctor has betrayed his own people and is working for Invisible aliens known as the Vardans who have taken control of the citadel and The Doctor has banished members of the high council and Leela to the wasteland outside the Citadel. But the Doctor has his own agenda, he is planning to thwart the Vardans scheme and time-loop their planet. But what the Doctor doesn't know, is that the Vardans are working for the Sontarans who are the real masterminds and are preparing to invade Gallifrey. Written by
Did You Know?
In the original ending, Leela was killed by a Sontaran trying to save the Doctor's life. But it was changed, since it was felt it would be too traumatizing for the younger viewers, and it was changed to Leela remaining behind on Gallifrey and falling in love with Commander Andred. See more
In the episode "Invasion of Time" (1978), an alien soldier, chasing someone through a swimming area, trips and falls over a deck chair. See more
[the Doctor tries to open a secret passage with his trusty sonic screwdriver
[breaking the fourth wall
Even the sonic screwdriver won't get me out of this one.