Classic public domain film, digitally preserved and free to stream forever.
The Doomsday Machine (1972) is a low-budget sci-fi film in which a Chinese doomsday weapon capable of destroying the Earth's surface is about to be activated, prompting a hastily assembled crew — including several women added for the species' survival — to launch a spacecraft toward Venus as the world ends behind them.
Starring Denny Miller, Grant Williams, and Ruta Lee. This film is in the public domain and free to watch, download, and share.