PHANTOM FROM SPACE (1953)

A narrator tells us, "It began right after sunset," as we're looking at stock footage of fighter planes in broad daylight. The first four minutes of this snoozefest are composed entirely of stock footage, including stuff I recognized from 1950's Radar Secret Service.
Here's what passes for the plot: an invisible space alien lands in Santa Monica, California. After killing two men who attacked him due to his "menacing" spacesuit (which resembles a leotard with a diving helmet), the creature takes it off while government authorities pursue him. As scientists examine the suit in their lab, a pair of scissors becomes magnetically attached to it. However, just moments before, one of the scientists tried unsuccessfully to cut the suit with those scissors, and there was no magnetic effect at all.

Director W. Lee Wilder knew exactly how to keep this film within its virtually non-existent budget: rather than showing the action, have witnesses describe it after the fact; make your alien invisible, thus eliminating the need for make-up and costuming; make sure nothing in your script calls for special effects that would cost anything; hire Z-grade actors with names like Nora Nash and Sandy Sanders; and pad it out with gobs of stock footage.
PHANTOM FROM SPACE consists mostly of exchanges of dry dialogue, quasi-scientific chit-chat, and endless scenes of people running up and down hallways and stairs. The last couple of minutes are interesting, but you have to sit through a lot of tedium to get there.