12 episodes were originally broadcast in 1981
The TARDIS is drawn into an empty white void, somewhere between universes.
When Rorvik learns that Romana is a time sensitive, he takes her prisoner, forcing her to find a way out.
As the void begins to shrink around them, Rorvik plans to take desperate measures to escape through the mirror.
With the void collapsing around them, time is running out. Rorvik ignores the Doctor's warnings.
The Keeper of Traken is nearing the end of his long reign and he requests the Doctor's help.
As Melkur begins to return to life, it manipulates Kassia into doing its bidding.
The Keeper nears the end of his life and Melkur is poised to take control of the all powerful source manipulator.
Melkur has become the new Keeper of Traken and begins to access the source manipulator.
Deciding to repair the TARDIS's chameleon circuit, the Doctor goes to Earth to find a real police box.
The Doctor travels to the planet Logopolis in the TARDIS where a series of fateful events are set in motion.
The Master is loose on Logopolis and is determined to learn the planet's secret, but there is more at stake.
With the fate of the entire universe hanging in the balance, the Doctor and the Master are forced to collaborate.