An old Jewish baker struggles to keep his business afloat until his young Muslim apprentice accidentally drops cannabis in the dough and sends sales sky high.
Coal Hill School has been a feature of Doctor Who since the first episode, but now we get to see the day-to-day adventures of the students coping with intrusions from space and time.
When the news is announced that a comet is on an unavoidable collision course with Earth, the most hilarious and unexpected chain of events imaginable is set in motion.