Finally listened to the Eight Doctor audio Orbis. Despite some negative reviews I found this story to be quite fun and yet has the underlying darkness of the Vengeance of Morbius.
Basically after Morbius the Doctor was marooned for 600 years on the planet Orbis which is inhabited by peaceful jellyfish who are under attack by a race of evil oysters.
It does have some really nice bits like the Doctor being more pleased to see his companion is wearing tights than actually seeing her for the first time in centuries. The quote "Tonight we bury our dead, tomorrow we build stilts" is awesome BTW. Also it looks like an arc may be in store for this season which is good as season 2 really suffered from a lack of a coherent storyline.