Werthan – More Info

They say that some corners of the universe have bred the most terrible things, things that act against everything that we believe in. But even in the deepest reaches of space, sometimes the greatest threats are those we bring with us, the ones that are hidden in the darkest corners of the human mind…
Sometimes we live in nightmares of our own making…
Can even the Doctor find a solution, when the sleep of reason produces monsters?
This story features the Fourth Doctor and K9.