San Helios
San Helios was a planet which was connected to Earth with in wormhole.
Astronomical data
San Helios was in the Scorpion Nebula, on the other side of the universe from Earth. it had 3 suns, two blue and one red. The Doctor believed that they had the ability to enhance psychic powers, increasing Carmen's precognition. It appeared to have roughly equal gravity and atmosphere as Earth.
San Helios originally had a varied topography, with oceans, forests and deserts, but after the attack by the Swarm the whole planet was covered in lifeless sand. (DW: Planet of the Dead)
History
San Helios once had an advanced civilisation with a population of 100 billion, and cities like San Helios City. San Helios traded in "waste products" with the Tritovore race. Around 2009 it was ravaged by the Swarm, and all life on it devoured, turning the planet into a desert planet in less then a year.
After feeding off of San Helios, the Swarm attempted to open a wormhole to Earth, accidentally trapping a group of humans on the planet in the process. The humans eventually escaped to Earth through the still-open wormhole, and Doctor Malcom Taylor closed the wormhole. (DW: Planet of the Dead)
