Jim Bergerac is a detective sergeant in The Foreigners Office who likes to do things his own way. While dealing with his own personal demons Bergerac has a knack of finding trouble, and sometimes causing it.
The arrival of a mysterious comet heralds impending danger from enemies both old and new. As Ace helps the Doctor defend Earth, she is confronted with a dangerous question..."Doctor Who?"
The Doctor and Mel go for a holiday trip to Shangri-La aboard a Nostalgia Tours bus, only to get dragged into the battle against genocide of their fellow passenger Delta, a Chimeron Queen fleeing from the Bannermen who wish to make her species extinct.
