S1 E1

The Doctor investigates strange happenings at a top secret government drilling project.

S1 E2

The Doctor begins to suspect that penetrating the earth's crust will create more Primords.

S1 E3

The Doctor finds himself in a parallel universe where Britain is under a dictatorship.

S1 E4

The Doctor must convince the Inferno staff not to penetrate the Earth's crust.

S1 E5

The Doctor begins to realise the alternate planet Earth has passed the point of no return.

S1 E6

The Doctor asks his friends' counterparts to help him return to his own world.

S1 E7

The Doctor must save his Earth from the same disastrous fate as the alternate version.