Aizawa and class 1A went to different worlds to bring back powerful people so they can help if a war breaks out against the villains. Shimmer is the person who can open different dimensions. Luckily Guest was brought back from a world where zombies and wars go on. Now Guest is now in mha world. Guest is more powerful than they look. Guest doesn't know what a TV or modern stuff looks like. In Guest world quirks were 25 percent chance of you getting and the quirks were 2x more powerful then mha world quirks.