1.) You can kill a Giant Floating Brain by hitting it with a baseball bat on the Fissure of Rolando (The Brain from Planet Arous)
2.) You can dissolve a Giant Radioactive Reptile by immersing it in water charged with Oxygen Destroyer (Pat. Pending, Sarizawa) (Gojira/Godzilla – 1956 version only)
3.) A torpedo filled with radium will also kill a Giant Radioactive Reptile (The Giant Behemoth/Behemoth the Sea Monster)
4.) In a pinch, you can build a hydrogen bomb out of plastic belts (The Cape Canaveral Monsters)
5.) You can disintegrate sea monsters made of corpses mixed with atomic waste by using a little sodium (you’d expect potassium , rubidium , and other alkali metals to do a good job, too, but the film doesn’t mention them) (The Horror of Party Beach)
6.) You can freeze inconvenient blob monsters with a freezer or ice rink or, in a pinch, using carbon dioxide fire extinguishers (The Blob (both versions), Beware the Blob)
7.) The best way to get rid of pesky alien monsters infesting your spaceship’s air ducts is to simply open the airlocks. If the lack of oxygen doesn’t kill them, they’ll get sucked out into space. Be sure to put ion your spacesuit first, and lock yourself down. (It! The Terror from Beyond Space, Alien, Aliens)
8.) If you’re having a lot of trouble with something, try dousing it with water. This sometimes works surprisingly well, although you may have to mix in some salt. Don’t try with Gremlins, though. (*The Wizard of Oz, Day of the Triffids (1964 version only), The Monolith Monsters)
9.) Ultrasound can do wonders for stubborn, hard to destroy Things from Outer Space ( Invisible Invaders, Target Earth, Earth Vs. the Flying Saucers, The Angry Red Planet)
10.) Some Things from Outer Space are very susceptible to being electrocuted, though (The Thing – 1951 version – Little Shop of Horrors --1987 version only)