Guido was one of Sal Maroni's Goons in Batman: Gotham Knight.
Biography.[]
The Anton Incident.[]
When his boss Sal Maroni was puking off the side of their boat, Guido was watching him the whole time. As Maroni began berating his goons for waiting around instead of putting The Russian in his grave, he puked over the side again. When Maroni recovered, he suddenly discovered the boat driving on its own and sends Guido to investigate the cause.
Arriving in the boat's cockpit, Guido finds a remote-control device operated by Batman to drive Maroni's boat into The Russian's. When the two boats were side to side, the two gangs were about to kill each other, but Batman stopped them and captured Maroni and The Russian and he orders a truce between the two mob bosses. But then, Guido fires his revolver at Batman, causing his bullet to bounce off the Batsuit's electromagnetic force field and it wounds Anton, one of The Russian's goons.