In a desolate, post-invasion future, a lone soldier designated S.U.M.1 is thrust into a claustrophobic nightmare. Portrayed by Iwan Rheon, the young private is assigned to a remote underground bunker, tasked with a solitary and monotonous mission: protect a vital sector of humanity’s last defensive barrier from the relentless alien threat that now dominates the surface. As the endless days of isolation wear on, his sanity begins to fray, plagued by strange noises and unsettling visions that blur the line between paranoia and reality. The tense atmosphere, crafted by director Christian Pasquariello, builds a palpable sense of dread as S.U.M.1 questions his orders, his environment, and the very nature of the enemy he is meant to fight. This gripping sci-fi thriller explores the psychological toll of extreme solitude and constant fear, trapping the audience with its protagonist in a high-stakes mystery where the greatest threat may not come from the outside.