Ranked #3 of 6 in Season 1•matches the season avg
Quatermass picks up Carroon's trail and believes that the mixture of chemicals he has taken will accelerate his metamorphosis. Meanwhile, the killing starts - and Westminster Abbey a pulsating mass is revealed clinging to the building.
Reginald Tate
Professor Bernard Quatermass
Isabel Dean
Judith Carroon
Hugh Kelly
John Paterson
Duncan Lamont
Victor Carroon
Paul Whitsun-Jones
James Fullalove
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"An Unidentified Species" is episode 5 of The Quatermass Experiment season 1. It scored 6.6/10 from 11 votes, ranking #3 of 6 episodes this season (season average 6.6). It aired on August 15, 1953.
