Mo was a henchman of Two-Face.
Manny and Mo were sent to capture Shifty Drake, but only found his son, Tim. With Two-Face's help, they kidnapped him, and brought him to the docks. There, they encountered Batman, but managed to defeat him. Later, Manny and Mo helped their boss when the city was in the grip of "The Judge". They kidnapped councilman J. Carroll Corcoran in the hope that they might learn the Judge's identity or whereabouts. The Judge interfered as Manny and Mo were about to execute the councilman, knocking both of them unconscious.