It was a six-part mini-series broadcast live in 1953 on British TV to record ratings!
It was remade in 1955 as the first horror film from Hammer Studios!
If the plot is familiar, but the title isn't, that's because it was released in the US as Creeping Unknown, becoming a late-night tv staple in the 60s-70s.
The British title, Quatermass Xperiment, isn't a typo!
The gimmick worked and the movie was one of 1955's top-grossing pix in England!
The 90-minute Quatermass movie is an amazingly-accurate adaptation of the original 3-hour (six half-hour episodes) mini-series, with the only major change coming at the end of the movie. (We'll be discussing it later.)
BTW, it's not the first Hammer Studios sci-fi film!
(That honor belongs to a little-known 1953 film called Four-Sided Triangle, about two scientists who use a matter-replicator to duplicate a woman they both lust after!
It's not a comedy!)