The Vanquishers

Split across three realities, the Thirteenth Doctor has more than one problem to solve. The Division's base, way out in the Void, has been taken. Some unlikely allies have joined together, hoping to find victory in Earth's final hour. The Grand Serpent has been making plans, and the Doctor's oldest enemies hold the key to the Doctor's past, poised on handing her their final retribution.

Tunnels beneath the Earth lead to all kinds of places in space and time. As the final Flux event approaches, which door leads to victory? Last call before the end. It's time for contact.