Quatermass escapes from the Plant as it explodes and returns with Pugh to the Rocket Group where Dillon and the zombies have taken over. Pugh and Quatermass plan to go to the asteroid in the Quatermass II rocket and destroy the alien force.
Pugh finds that the objects are coming from an asteroid and Quatermass goes with journalist Hugh Conrad to talk to the workforce from the Plant. That night, many objects fall in the area to be collected by the guards.
The serial sees Professor Bernard Quatermass of the British Experimental Rocket Group being asked to examine strange meteorite showers. His investigations lead to his uncovering a conspiracy involving alien infiltration at the highest levels of the British Government. As even some of Quatermass's closest colleagues fall victim to the alien influence, he is forced to use his own unsafe rocket prototype, which recently caused a nuclear disaster at an Australian testing range, to prevent the aliens from taking over mankind.