- Country: UK
- Genres: Thriller
- Release: 2015-08-25
- Director: Joe Eckardt
- Writers: Stuart Gallop
- Language: English
- Stars: Corin Nemec , Rebecca Blumhagen , Nick Stevenson , William D. Coleman , Fabian Ramirez , John Michael Scholl
- Runtime: 80 min
- Awards: N/A
- AKA: Extinction: Patient Zero (United States of America) , Underground (United Kingdom) , Extinction: Patient Zero , Extinction: Patient Zero (United Kingdom)
- Plot: A group of scientists trapped in a safe room have a limited time to discover if they've been infected by a deadly virus and whether they can escape or face the exposure protocols that have been activated.
- IMDB:tt2273722