This is one of those dicey matches. Mr Fantastic has a lot of good tech like his jets and his many Infinity Gauntlets, but I don’t see him taking Bowser down. Bowser has his Giga Bowser form and he has a lot of dark magic that he can use to enhance his attack power. He’s surprisingly quick when he needs to be and Mr Fantastic’s overwhelming edge in intellect won’t be enough to save him here. Bowser wins.