Killers from Space

Killers from Space, starring a very young Peter Graves, is a 1954 alien invasion movie that includes an atomic bomb test.

I liked the pneumatic tube messaging system. I got quite tired of him running his hands through his hair while he stared at the "giant" creatures. He stares, then runs his hands through his hair... over and over...

via Youtube:

1000 Misspent Hours says, "Killers from Space is a film which, in other hands, might have turned out exceedingly well."