Spike was a former mechanic and ally of Atlas.
Spike was a mechanic and former servant of Atlas. He was in charge of equipping weapons and other tools onto Atlas so that he was always battle-ready. Atlas was afraid of losing him because he heavily relied upon Spike to equip all his weapons for battle, as Atlas himself did not know how to equip himself. Atlas always treated Spike badly, abusing him all the time. Spike kept Atlas running until Robin convinced him that Atlas was only using him. Spike accepted that Atlas was unbearable and left with the Titans when Atlas was defeated. Spike's current whereabouts are unknown.