Mario was one of the thugs working for the criminal organization known as Danger Danger.
Mario participated in Danger Danger's raid on the Czechoslovakian military base and toxic waste dump (which was a front for a secret rocket launch facility). In an attempt to keep John Jack from stealing the second rocket, Mario stole the launch key needed to start the countdown. Despite Furio's encouragements over the radio and the attempts from the other Danger Danger thugs, Mario caught by crossfire between Jack and Czech army. Being unarmed, he wasn't able to defend himself and take cover in a corner until whole ordeal blows over. Jack was able to retrieve the key from the room that Mario got cornered and take off after the first rocket to the Moon.