From this video published on October 11, 2016.

"Top 15 Silver Age Sci Fi - Monster Madness X movie review #11."

These are sci-fi films from the 1950s.

1-5 are "alien invaders"
6-10 are "monsters on the loose"
11-15 are "scientific disasters"

16 is an honorable mention for "alien invaders"
17-18 are honorable mentions for "monsters on the loose"

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Status: Complete
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My "James Rolfe" series:
James Rolfe's Top 5 Godzilla Films For Beginners
James Rolfe’s Top 5 King Kong Ripoffs
James Rolfe's Top 5 Movies About Making Movies
James Rolfe’s Top 10 Hitchcock Films
James Rolfe’s Top 10 Horror Remakes
James Rolfe’s Top 10 Lost Horror Films
James Rolfe's Top 10 Most Disturbing Horror Films (Pre-Code Era)
James…