The meteor crash is footage of the spaceship crash from It Came from Outer Space (1953) which Universal produced four years earlier.
Universal Pictures released this film on a double feature with Love Slaves of the Amazons (1957).
The scene showing the last attack of the monoliths appears on a TV in the homeless compound scene of the 1988 John Carpenter film, They Live (1988).
Released in the UK in December 1957 as supporting film to The Lady Takes a Flyer (1958).
The only movie monster to be a purely chemical process.