Warzone by Chris Chapman
At Warzone, competitors gather from across the galaxy to test the
limits of their endurance and achieve their personal best. So, when the
TARDIS materialises in the middle of a racetrack, the Doctor and his
friends must literally run for their lives.
Conversion by Guy Adams
On the fringes of the galaxy, techno-pirates and research medics
fight for the secrets of advanced extra-terrestrial technology. For the
Doctor, however, a more personal battle awaits as he confronts his own
guilt and the creatures that killed a friend: the Cybermen.