(You are the superman of this universe)

You were in your normal house watching television when you feel a knock on the door, when you open the door you see something similar to a goblin, the goblin's skin is blue, with tied white hair, purple eyes, with purple clothes and an orange cape with pearls around his neck, the leprechaun looks at you with a smile and says

Superman!! I am Mr Mxyzptlk an interdimensional peacemaker and I need your help!!