Plastic Treachery(2010)

Overview

A meteorite crash lands in a college field based in Bristol, however the despite the nature of the event the college is kept open by the college principal, Roger Tersam. The fourth Doctor soon arrives having tracked down the metorite while travelling in the TARDIS. Upon reaching the college the Doctor discovers that one of the cleaners has been murdered and the college is now the centre of an Auton invasion plan.