Long ago in the days of the nes, Bowser and Doctor Robotnick Teamed up to finish of mario once and for all. Bowser kidnapped Princess Peach as bait and waited for mario to save her. Just as Mario was about to save peach. Doctor Robotnick zapped Mario with a special device and created Shadow Mario who turned against all his friends and almost wiped out the video game world. Fast Forward to the days of the Nintendo Wii where Shadow Mario attacks Mario and Luigi. Shadow Mario starts a video game war and now it's up to Megaman, Luigi, Sonic, Bowser and Mario to stop Shadow Mario once and for all.