One day, Mario and Luigi were eating at a pizza restaurant when, all of a sudden, a portal opens and warps Mario, Luigi and Yoshi to LEGO Universe, where they find Bowser and his minions waiting for them. So, you have to defeat all of Bowser's minions in a LEGO game style (eg: LEGO Batman) in the LEGO Universe and beat Bowser. Later, you must fight many enemies from many LEGO themes and in the end, you must defeat the lord of all shadows in his final form.