AU. On the Mario side, it takes place after "Storm of Hearts". On the Ben 10 side, it takes place during an alternate universe of Omniverse. When a strange alien force comes to Bellwood, it is up to Ben and his team to defeat it. But, they might need help...in the form of Mario and his friends! Please read and review! And always think outside of the box!
Rated: T - English - Adventure/Romance - Chapters: 7 - Words: 6,327 - Favs: 2 - Follows: 1 - Updated: 3/13 - Published: 6/17/2014 - Complete