The film is about an American company based in South America and its employees are ordered to kill each other or be killed.
On May 18, 2015, John Gallagher Jr. joined the cast. On May 19, 2015, Tony Goldwyn joined the cast. On May 20, 2015, Melonie Diaz was cast in the film. On May 22, 2015, Michael Rooker joined the cast. On May 28, 2015, Gunn’s brother Sean Gunn was cast in the film, along with Steve Agee, David Dastmalchian, Gail Bean, and Valentine Miele.
On June 1, 2015, Gunn announced on his Twitter feed that David Del Rio, Stephen Blackehart, Josh Brener, and Rusty Schwimmer had joined the cast.
On June 2, 2015, Gunn announced on his Facebook page that Joe Fria, Benjamin Byron Davis, James Earl, Brent Sexton, and Mikaela Hoover were also cast.
On the review aggregator website Rotten Tomatoes, “The Belko Experiment” has an approval rating of 57%, based on seven reviews, with an average rating of 4.3/10.
At Metacritic, which assigns a normalized rating, the film has a score of 64 out of 100, based on four critics, indicating generally favorable reviews.
The fact that James Gunn wrote the script is already a plus factor for “The Belko Experiment” and it seems that the producers are taking advantage of it with the ongoing promotions for the office gore movie by indicating that it is Gunn’s film.