Lakithunder is a boss from New Super Mario Bros. for the Nintendo DS. He appears as a castle boss in World 7, meaning that he must be defeated in order to access World 8. Lakithunder can attack by shooting lightning bolts at the Mario Bros. and dropping Spinies to attack them. The only way Lakithunder can be hurt is by jumping on his head, but because he stays primarily in the sky, Mario or Luigi must wait till he descends for an attack.
He also appears in Super Mario Galaxy 2.