Bottom Feeder

A rugged salvage crew member who keeps the group grounded under pressure. He helps coordinate escape routes and make practical, quick decisions in the tunnels. He dies during the failed counterattack as the tunnel walls collapse around the team.

Leader of the salvage crew, protective of his niece Sam and focused on securing equipment and safety. He fights to survive and protect others, improvising plans as threats close in. After a brutal confrontation, he becomes infected by Leech's serum, joining Sam in a new, hunger-driven struggle.

Vince’s niece and a newcomer to the salvage crew, brave and curious under dangerous circumstances. She witnesses Callum’s death and fights to escape the increasingly perilous underground. She and Vince later confront the serum’s consequences together.

A cunning operative who is revealed to be a double agent; she plays a dangerous game between sides. She injures her leg during the mission to set explosives and sacrifices herself to secure the plan, while secretly serving a larger governmental agenda.

Charles Deaver’s loyal agent tasked with retrieving Leech. He underestimates the threat of the monster and is killed during the confrontation as Leech regains strength.

A researcher chasing a regenerative serum, whose discoveries come at a brutal cost. The serum awakens a primal hunger that mutates him and drives him to hunt intruders. His actions trigger a brutal chain of betrayals and desperate measures.

A member of the salvage crew whose curiosity leads him into danger. He is killed by Leech, a stark reminder of the monster’s reach and the stakes of the intrusion into the hospital.

A wealthy magnate who funds the serum project, driven by survival at any cost. He dispatches Krendal and Wilkes to retrieve Leech, unaware of the political and moral fallout. His pursuit of power ends in a brutal demise at Leech’s hands.

The physician who explains the serum’s deadly catch, only to be shot by Krendal and injected with the very serum he helped develop. His death marks a turning point in the chain of consequences unleashed by the project.

A musical group appearing as themselves, drawn into the chaos of the underground conflict. Their presence underscores the film’s momentary escape into humanity amid horror.