Two siblings Ava and Milo Beckman, known as Nitro Boy and Clearity, travel to from their war-torn home dimension to Earth-616. They seek the aid of the X-Legion to help the resistance fight against an evil variant adult version of Lucifer Beauregard who has seized control of their dimension. So, the X-Legion must decide whether to intervene in this interdimensional conflict and help the sibling reclaim their home.
P.S. this story is after Marvel's Mutant Uprising.
