Doctor Who - Past Doctor Adventures - 05 - Illegal Alien (7th Doctor)

Britain is at war. Night after night the Luftwaffe
are bombing London. A serial killer dubbed the Limehouse Lurker is
stalking the rubble-strewn streets. But a deadlier threat falls from the
sky in the shape of a sinister silver sphere...

Cody McBride, ex-pat American private eye, sees the sphere crash-land
and split open — and glimpses something emerging from within. But the
military dismiss his account of events — the sphere is simply a new
German secret weapon that has malfunctioned in some way. What else could
it be?

Arriving amid the chaos, the Doctor and Ace are the only people to
believe McBride. The sphere bears all the hallmarks of sophisticated
alien technology — and whatever was inside it is now loose in London.

Before long the Doctor and his friends have embarked on a trail that
brings them face to face with hidden Nazi operatives — and some very old
enemies...

Featuring the Seventh Doctor and Ace — plus the Cybermen — this adventure takes place after Survival.