Godzilla is the grandfather of all kaiju monsters, and he's been around for so long he's been reimagined for the big and small screen at least a dozen times since 1954.
His latest “evolution” is the Shin Godzilla form, which is 118.5 meters tall, but originally Gojira was half that size and would have looked kind of silly trying to trash modern Tokyo.
That little red scribble is the 50m tall O.G. Original Godzilla up against Tokyo 2016, and while he's still big enough to gobble people up and smash cars he'd have a hard time bringing those skyscrapers down. I guess that's why he had to grow up too!