You must follow Sylvia, the last human survivor and find out how the Daleks invaded the Earth. This page may contain spoilers
Below is a guide for the level.
You’re in London, 1963. The Daleks have invaded. Keep walking until you are the other side of Nelsons Column.
In front of you is an overturned Taxi which you can walk across to get to the other side.
The on screen instruction state that when you are near the Daleks you will automatically crouch down. Keep turning right until you get to the Taxi.
You have to walk up to the Taxi and press enter.
A cut scene shows the Doctor and Amy pushing the Taxi so that it crashes into the wood blocking the Underground entrance.
You have to use the Sonic Screwdriver to open the Underground gate.
A cut scene shows how the Daleks came to Earth. You will have to ask Sylvia some questions, it doesn’t matter which order.
The Daleks flying through a crack in the sky to Earth.
The cut scene ends when a Dalek appears.
Sylvia runs on, wait for the Dalek to pass.
You can either run to the 3rd cover and wait for the Dalek to go past or try and get past the Dalek by keeping to the left side.
The Underground track is live so you will have to stop it.
Above is one of the ways you can link up the circuit.
Follow Sylvia to the end of the tunnel, then climb up the ladder.
Sylvia will stay behind trying to set up a bomb, it explodes killing her and the Daleks underground.
A cut scene explains that the Daleks have changed their patrols so you will have to be more careful.
If you turn right you can go back the way you came.
If you run to the broken Taxi on the right you can avoid the Dalek sensor.
Keep to the edges avoiding the Daleks.
Run back to the Tardis. You will have completed Stage 1 when you return to the Tardis.