Don Mason

As part of his plan to destroy Marineville, Surface Agent X20 infiltrates the base by posing as a professor who can teach mute people to speak. Then, unknowingly, Troy and Phones place Marina in his hands.

Troy and Phones are sent to investigate the destruction of a WSP submarine. They are soon captured by an enemy submarine in the form of a gigantic fish, which takes them to the underwater city Titanica. There, they meet Titan for the first time.