DOCTOR WHO lands on the planet at the same time as the expedition's rescue team, and is immediately taken prisoner - the suspected murderer. But even stranger things soon begin to happen ...

What terrible creature inhabits this wild, desolate planet, killing mercilessly, lurking in the depths of the Black Pool? Will anyone ever be allowed to leave - alive?
 

A diustress signal brings the Doctor to the planet - but his good intentions are not appreciated. The commander of a Morestran rescue party, sent to investigate the disappearance of the survey team, is convinced the Doctor is the killer.

And while the Doctor is kept prisoner and powerless to act, the merciless hell-planet claims even more victims ...
 

"HERE ON ZETA MINOR IS THE BOUNDARY BETWEEN EXISTENCE AS YOU KNOW IT AND THE OTHER UNIVERSE WHICH YOU JUST DON'T UNDERSTAND!"

A distress call from the last planet in the known universe forces the TARDIS to commence emergency materialisation on Zeta Minor. Simultaneous with the Doctor's arrival, is the landing of a spacecraft from the planet Morestra on a rescue mission to recover a missing group of scientists. An expiditionary force from the spacecraft soon uncovers their sinister remains, but who or what has caused their gruesome deaths?

Only one scientist, Professor Corenson, has survived and he is hell-bent on tapping the powerful resources within Zeta Minor to save his ownplanet which is slowly dying. But he and his compatriots canot possibly realise the full extent of the dark forces at work. And so it is left to the Doctor to convince them that Zeta Minor is indeed the Planet of Evil...