Air: Nov 1 1986. 4 eps.
Saddened at the loss of his companion in the previous case, The Doctor has decided to present his own evidence. He along with a future companion, Mel arrive on The Spaceliner Hyperion III, a seemingly peaceful cruise ship, but deep within the bowels lies pods containing deadly plant-like Vervoids. They go on a rampage murdering the passengers. And what’s worse the ship is on course towards a black hole. Can this be too much for The Doctor to handle?