"Quatermass II" comprised six half-hour episodes, transmitted live from Studio G at the BBC's Lime Grove Studios in London. The episodes — individually subtitled "The Bolts", "The Mark", "The Food", "The Coming", "The Frenzy" and "The Destroyers" — were shown every Saturday night at 8 p.m. from 22 October to 26 November 1955; because of the live nature of the performances, most of the episodes overran their allotted half-hour slots slightly. Each episode was rehearsed on the Monday to Friday before transmission at Mansergh Woodall Boys Club in St John's Wood, London, and then camera rehearsed in studio for most of the day on the Saturday.