In Agua Dulce, California, the Haywood family trains horses for film and TV productions. One day at the Haywood ranch, small metal objects unaccountably fall from the sky. One of which, a nickel, kills Otis Haywood Sr (Keith David). His children, Emerald “Em” Haywood (Keke Palmer) and Otis “OJ” Haywood Jr. (Daniel Kaluuya), continue to run the business. However, due to the loss of a contract, they have to sell some of the horses to Ricky “Jupe” Park (Steven Yeun), who operates a Western theme park called Jupiter's Claim. One night, the Haywood’s notice the electricity supply fluctuating and their horses violently reacting to an unknown presence. They discover that something has been taking their horses and regurgitating inorganic matter, which OJ believes caused their father's death. The Haywood’s decide to obtain proof and subsequently ask electronics store employee and UFO enthusiast, Angel Torres (Brandon Perea) to set up surveillance cameras.