Sorvin

Sorvin was a Tritovore who came to San Helios to trade.

Biography
He and his colleague, Praygat, were marooned on the barren planet when their ship's drive system cut out. They used surveillance cameras to observe the planet until they saw the arrival of the number 200 bus. They brought the Tenth Doctor and his companion, Christina de Souza, back to their ship as they thought that they were behind the destruction of San Helios. However the Doctor proved them wrong and offered to help them. The Doctor and Christina got the equipment to get the bus back through the wormhole and asked the Tritovores to accompany them. Sorvin was reluctant at first, but soon warmed to the idea. Moments later he was eaten alive by a Stingray.

Behind the scenes

 * Sorvin was not named on screen, only in the credits.