Depth Charge was once an Imperial Peace Marshal, whose territory was completely destroyed, and every robot under his protection slaughtered, by the malicious entity known as Protoform X. Since that fateful day, Depth Charge has lived for no other purpose than to enact justice (or vengeance) on X. His single-mindedness makes him a relentless hunter, stopping at nothing to prevent X from taking any more lives. His quest has more than taken its toll on Depth Charge, though — whatever he was before, he is now a joyless, hollow shell of a being. While he sometimes expresses sympathy for other beings and lends aid to his fellow Maximals, Depth Charge has clearly been consumed by his mission, and the destruction of Protoform X is now more important to him than the original reasons behind his quest. He is also one of the more SERIOUS characters.
- Depth Charge will be Indigo Marble's Guardian.