Super Mario: The Returning Darkness

After Bowser invades the Mushroom Kingdom once again, it becomes Mario and Luigi's goal to defeat the King of Koopas again, but after an unknown source sends Bowser a technological weapon to use in battle, along with a mysterious Green Emerald, Bowser now has a weapon that he knows that the Mario Brothers won't be able to stop him with.

Custom renders by the following:
Geno by Mutation Korno
King Boo by Hydro Plumber
Mario by alsyouri2001
Dark Bowser by flamebeetle