The Day the World Ended was filmmaker Roger Corman's modest entree into the realm of science fiction. The film begins at "The End"--or rather, the years following an all-out atomic war. A group of survivors find refuge in a well-protected valley owned by Maddison (Paul Birch) and his daughter Louise (Lori Nelson). Conflicts of a romantic nature erupt among Louise and her two erstwhile suitors, gun-wielding Tony (Touch--later Mike--Connors) and geologist Rick (Richard Denning), but these are shunted aside when it develops that the valley is infested with mutated, radioactive animals. Before long, a few similarly mutated human beings begin wandering into view (one of these is played by Jonathan Haze, the future star of Corman's Little Shop of Horrors). Carefully staying within its limited budget, The Day the World Ended is a well-crafted, thought-provoking apocalyptic fable. The film was inadequately remade in 1966 as Year 2889.
by Hal Erickson synopsis