Sarath

Sarath was a planet visited by the First Doctor, Susan Foreman, Ian Chesterton and Barbara Wright. The inhabitants were humans who didn't realise that they had travelled through space before because of a hazy history. The planet was soon to be destroyed by pieces of the Sarath moon breaking up and crashing to the surface after a meteor struck it. The residents of Arkhaven- the last surviving suitably advanced city- were building a rocket to try and escape the devastation to travel to the neighbouring planet of Mirath. (PROSE:  City at World's End)