In 2015, Leone launched a campaign on the crowdfunding website Indiegogo to finance Terrifier, a feature-length spin-off of All Hallows' Eve. After being notified of the Indiegogo campaign, filmmaker Phil Falcone provided the necessary funds for the project in exchange for a producer credit. In The 9th Circle, the short film Terrifier, and All Hallows' Eve, Art was played by Mike Giannelli, who opted not to return to the role for the feature film Terrifier due to not wanting to pursue anymore major acting roles. Instead, the role of Art was recast to David Howard Thornton. Thornton was already familiar with All Hallows' Eve when he auditioned for the role of Art in Terrifier, and was cast in the role after improvising a kill scene in mime.
The film starts somewhat problematically with the inexplicable casting of Venezuelan actor Édgar Ramírez as an Orthodox Jew who gets pulled out of his home by SS Officers and killed in front of his daughter Elsbeth (the gifted Bella Ramsey from Game Of Thrones). With nowhere to go, she ends up saved by the Resistance, where she meets Marcel, along with Emma (Clémence Poésy), who gives a well-rounded performance despite being saddled with love interest duties for Marcel. Every time he does a mime trick, for example, we cut to Emma looking impressed and amused as the soundtrack swells. This film takes virtue signaling literally. 153554b96e