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Warning Sign is a 1985 American science fiction-horror film directed by Hal Barwood and starring Sam Waterston, Kathleen Quinlan, Yaphet Kotto, Jeffrey DeMunn, and Richard Dysart.

Plot

In a secret military laboratory operating under the guise of a pesticide manufacturer, a sealed tube is broken, starting an outbreak of a virulent bacteria. Detecting the release of the biological weapon, Joanie Morse, the plant's security officer, activates "Protocol One," a procedure sealing all of the workers inside from the outside world. Tom Schmidt, believing the cause for the lock down to be a pump malfunction, and co-worker Bob restart the pump.