Bottom Feeder

Charles Deaver, a wealthy magnate scarred by a car accident, backs Nathaniel Leech's risky serum project. The scientist explains that while the serum can regenerate dead cells, it triggers an overwhelming hunger that must be controlled with a special protein formula to prevent deadly side effects. Despite the warning, Deaver doubles down on the gamble, hoping the cure will give him an edge to survive and command power.

Deaver orders his ruthless henchmen to brutalize Leech to coerce him into continuing the research. The violence underscores how far Deaver will go for control over the serum. The doctor remains guarded, his experiments shaken but ongoing.

Krendal shoots the doctor and injects him with the serum, then locks him away in a tunnel system to observe whether regeneration is real. The experiment begins under tight security as the facility seals him in. The claustrophobic test aims to prove the serum's promise, regardless of the price.

With no protein formula, Leech’s hunger spirals, first driving him to feast on a rat and then a dog as his body mutates into a terrifying hybrid. The changes are brutal and rapid, signaling the potency of the serum and the peril of the patient. The scene establishes the monster's threat.

A separate group arrives on the same property—a salvage crew led by Vince Stoker hoping to strip an abandoned hospital of usable equipment. Among them is Vince’s niece Sam, who joins the expedition for the first time. The encounter sets the stage for a claustrophobic clash between humans and a transformed experiment beneath the surface.

As they explore derelict corridors, the crew descends into the tunnel networks beneath the property. Leech reaches full monstrous form and begins stalking the intruders. The group realizes the basement is now a hunting ground, and their numbers dwindle as the danger closes in.

The terror erupts when Leech kills Callum right before Sam's eyes, a brutal reminder of the creature's reach. The surviving crew fights to escape, pressing deeper into the storage areas while the mutated Leech closes in. The claustrophobic atmosphere heightens the threat as escape seems increasingly unlikely.

Back above ground, Deaver dispatches Krendal and Wilkes to retrieve Leech, and they systematically seal every exit except one, trapping Vince's team inside. The plan forces uneasy cooperation between rival factions as time runs out. The tension turns from pursuit to survival as the walls seem to close in.

Krendal and Wilkes confront the monster and shoot him, but Leech regenerates with terrifying speed and eliminates Wilkes. The near-fatal confrontation reveals the shared danger, pushing Deaver’s men and the salvage crew toward a fragile alliance. The revelation prompts each side to rethink loyalties in the face of an unstoppable threat.

Krendal drops a shocking truth: she has been a double agent, aiming to secure Leech's serum for the U.S. government to develop supersoldiers. The revelation shifts loyalties and raises the stakes as both sides reassess who can be trusted. The tense moment reframes the entire mission in a geopolitical light.

Leech ambushes Deaver in his limousine and decapitates him, delivering a brutal turn of the tide. With the mastermind dead, the remaining factions scramble to stop the creature before it escapes into the wider world. The power shift intensifies the race to contain the horror underground.

Vince and Krendal lure the creature back into the tunnel labyrinth while Otis and Sam fetch construction gear to mount a counterattack. Krendal injures her leg setting explosives and sacrifices herself so Vince can complete the mission. The setup builds a desperate, last-ditch effort to end the threat.

In a desperate close-quarters battle, Vince, Sam, and Otis hack Leech apart with power tools, tearing into his arms, chest, and head. The plan seems to work, but time runs out on the explosives and Otis is killed. The survivors scramble to seal the breach as the monster’s death throes echo through the tunnels.

A week later, Vince wakes in a military hospital, his body still marked by the brutal battle and the chilling possibility that Leech's serum has changed him. Doctors reveal that he and Sam have been contaminated by the dying scientist’s blood, binding them to the same ravenous hunger. A doctor connects Vince to an intravenous protein formula drip, signaling that the cure may be as perilous as the illness.