Sylvana

Sylvana was an artificial planet created by the World Builders. It was known as a Hollow World as its interior was a vast Pellucidic cavern. It was illuminated by a sun at its centre, making it a Dyson sphere. A day was roughly 26 hours on Sylvana. Sylvanians were the native life on the planet.

Bernice Summerfield visited Sylvana, having sex with one of its natives, Nialla. (PROSE: Oh No, Not Again)

Sylvana was one of the many planets which fell before Morbius in his war against the alliance. (PROSE: Warmonger)