Monster (1980)

aka's: It Came From The Lake/Monster, The Legend That Became A Terror/
Monstroid/Toxic Monster/Monstroid: It Came From The Lake/The Beast From Beyond

When a small Colombian village is viciously attacked by a sea monster from a nearby lake, a corrupt chemical company sends a specialist (Jim Mitchum) to destroy the beast and cover up their involvement with its creation. Supposedly based on a real event that allegedly took place in June of 1971. Also stars John Carradine, Philip Carey and Anthony Eisley. Also with Andrea Hartford, Glen Hartford and Coral Kassel.