Teenagers from Outer Space (1959)
Back in the 1950s, Hollywood discovered the teenager, hence: Teenagers from Outer Space.
Although somewhat older than teenagers, the alien visitors are bent on trouble with the intention of using the Earth as a breeding ground for monsters: a specimen of which they have brought with them.
Equipped with an appalling script, they also have a ray gun that reduces vertebrates to skeletons ....." You are not familiar with the focusing disintigrator ray?" and with equally risible performances it gets a 2/10 because the cast managed their lines without laughing.