Croupier, a feline companion, belongs to Enplein, an older gentleman who entered the prison facility voluntarily. Both are among five prisoners awakening from stasis within a secured, shutdown installation lacking visible guards or exits. The cat wears the same distinctive orange prison uniforms as the human inmates, his presence implying Enplein's deliberate choice to bring him into confinement. During the group's navigation of the amber-lit, isolated environment amid a power failure, Croupier remains closely associated with Enplein. The narrative suggests Enplein may hold critical information about the facility's purpose and their imprisonment, with Croupier integrated into the ensemble dynamic as the prisoners collaborate to uncover the truth behind their incarceration and seek escape.