Doctor Who: Empire of the Racnoss (Classic Doctors, New Monsters, #2.02)

When a distress call rips the TARDIS from the Vortex, dragging it back through time, it arrives in the midst of a conflict between Gallifrey and an ancient foe.

The Doctor, as ever, wants to help, but in returning a wounded combatant home, he becomes further and further entangled in a web of deceit and recrimination. A web spun by an eight-legged Empress and her minions…

The Empire of the Racnoss is at war, and wherever he stands, the Doctor is on the wrong side.