Altrazar. The temporal Atlantis, a place lost to time. Believed by many to be a myth, it has long been the perfect location for the rich and powerful to hide away their most dangerous secrets.

Until now.

Because the somewhat crooked, not exactly honest, wheeler-dealer cockney Time Lord known as Drax has found a map that leads to its location. And, at the behest of a manipulative businessman, he's going to use it.

When the TARDIS is dragged out of the space-time vortex, its crew aren't best pleased to see the Doctor's old school friend, even less when he pressgangs them into joining a raid on the most secure safe-house in history. However with Romana and K9 held hostage, the Doctor has little choice but to agree. With Drax in tow, he heads for the planet.

Which is where the trouble starts.