Dark Bowser is the evil version of Bowser. Er, I should say the MORE evil version. He is much more vile then Bowser. Mainly because he not only wants to take Peach, but rape her, kill her, kill Mario, and take over tha Earth! Did I mention he was evil. In SMBX, if you try to sell his shell, they will kick you out saying, "How dare you bring in something so fowl, so evil, so... dark!" But if you bring in his head, he will give you 10 coins. Odd.