Marble Arch station on Ravalox

Tags: Sixth Doctor, Peri Brown, The Valeyard

The Trial of a Time Lord: The Mysterious Planet, episode 1
6 September 1986

The Doctor’s trial is underway. The Valeyard’s first piece of evidence concerns the Doctor’s investigations on Ravalox, a planet ravaged by a solar fireball but bearing odd similarities to Earth. It’s not long before the Doctor’s natural curiosity gets the better of him. And where is Peri?