Mario was once a great hero until he decides to go into retirement after Luigi is murdered. Now living under the name Michael Camorelli, he spends his days doing little until the crime in Ferral City rises and he is told that the Koopa killed Luigi. Realizing he must do something, Mario returns back into the spotlight after over 20 years in retirement, hunting the street gang known as the Goombas and their mysterious leader Koopa.