The 1959 film Teenagers from Outer Space was pretty much a one-man production. Tom Graeff wrote, produced, edited, and directed the film, and he also did the music, camera work, and special effects. Oh yeah, he also played the part of Joe Rogers. The $14,000 budget was raised by charging the other actors to be in the movie. If you prefer to see the film without the MST3K treatment, it's also on YouTube.