Fan CastingTwelfth Doctor (2007-10)

The Doctor and Sally landed inside Sanctuary Base 6 on Krop Tor, a planet that was in perpetual orbit around the black hole K37 Gem 5, and lost the TARDIS following an earthquake. The crew of Sanctuary Base 6, having come to Krop Tor to discover the source of power emanating from the planet's core which allowed the planet to orbit the black hole, refused to divert their drill to collect the TARDIS. The Beast began terrorising the explorers and possessing their servants, the Ood. The Doctor and the science officer of Sanctuary Base 6, Ida Scott, descended into the core of the planet and discovered a pit which had started opening.read more