Spawn of the Slithis1978

Horror Vault's take

When radioactive waste seeps into the waterways near Venice, California, something ancient and mutated rises from the depths. The creature — dubbed Slithis — begins preying on the vulnerable souls who inhabit the canals and beachside margins, from stray animals to society's forgotten. A local journalist and a scientist race to understand what they're dealing with before the body count climbs higher. This low-budget late-70s creature feature leans hard into its coastal California setting for a grimy, grindhouse atmosphere.

Content: Monster Violence, Animal Attacks, Depictions Of Vulnerable/Homeless Individuals In Peril