Godzilla is a gigantic mutant dinosaur, transformed from the fallout of an atomic bomb test. As the Godzilla series continued, the great beast was developed as a character, and has become a savior of the earth, saving the world from other monsters (usually from Outer Space) like King Ghidorah, Gigan and MechaGodzilla, along with other monsters like Rodan and Mothra.
Worst nightmare to date! If you thought the movie was scary, imagine dreaming that you're being chased by this guy (who in my dream was also my neighbor) in a house that never ends. I was drenched in sweat when I awoke.