Keep Watching the Skies(1975)

Inspired by the American Horror films from the late 1950s, in a remote American lake a fisherman dislodges a canister which has been jettisoned from a flying saucer. A teenager and his girlfriend manage to convince the police of the existence of an all-consuming creature that has emerged from the canister, but it’s not long before all hell breaks loose and the creature from space consumes everything in its path.