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The TARDIS falls through a CVE into E-Space and arrives on the planet Alzarius. There the inhabitants of a crashed Starliner and a group of young rebels called the Outlers, led by a boy named Varsh and including his brother Adric, are being terrorised by a race of Marshmen who emerge from the marshes at a time known as Mistfall.
State Of Decay
The Doctor, Romana, K9 and Adric - an Outler from Alzarius who has stowed away aboard the TARDIS - arrive on a planet where the native villagers live in fear of 'the Wasting' and of three Lords named Zargo, Camilla and Aukon who rule from an imposing Tower. The Lords are soon revealed to be vampire servants of the last of the Great Vampires, a race referred to in Time Lord mythology.
The TARDIS is hijacked in the vortex by a time sensitive Tharil named Biroc, and brought to a strange white void. Biroc wants to free the others of his race who are being transported in a slave ship, captained by Rorvik, which is also trapped in the void. The only other thing present in the void is an ancient gateway leading to a decrepit banqueting hall.