The Beast in the Cellar is a 1970 British horror film written and directed by James Kelley. The film was produced by Leander Films and Tigon British Film Productions. It stars Beryl Reid, Flora Robson, John Hamill, Tessa Wyatt, T. P. McKenna and Vernon Dobtcheff.
Soldiers in a rural military base are being brutally murdered. They suspect a wild cat. Two local ladies: Joyce Balentine (Flora Robson) and Ellie (Beryl Reid) suspect it may be their brother, Steven (Dafydd Havard); a man who has been locked in a basement for thirty years.