you were taken for an experiment. During the time you felt your body changing and changing. As time went by, your memory of being human disappeared and you began to think that your new body was what you always were, you always were a Ghidorah, a giant three headed wyvern from space, that is what your mind told you. The scientists told the world about you so that you wouldn’t be attacked before releasing you with tons of giant items, including a giant backpack, a giant phone, a giant portable charger with basically unlimited power, etc. you were now wandering around the world.