This movie was originally planned to be first episode of a 12-part Australian Broadcasting Corporation horror series entitled 'Fright'.
This film's short-feature running time of 54 minutes is because it was originally intended to be a TV pilot episode when filmed.
Legend has it that some of the rats seen in the film escaped into other parts of the Australian Broadcasting Commission (ABC)'s studio and bred there. It is said that staff would not go to certain parts of the studio in fear of the rats from this movie.
This was the first theatrically released horror movie of the new wave of Australian cinema during the 1970s.
This movie's initial theatrical release in November 1972 in Australia was delayed because the film had been banned by the Australian Censorship Board. The film was not released until March 1973 where it was released uncut after appeal.