The Bolts
Episode: 1x01 | Airdate: Oct 22, 1955
Army captain John Dillon defies a clampdown to take the remains of a crashed object to Quatermass's British Rocket Group. Quatermass returns with him to the crash site - a huge domed chemical plant. While they are there, another small object crashes, a gas seeps out and a small bubble appears on Dillon's cheek.