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First Appearance: Cold Steel Heart
Voice: Robert Hayes
X51 was an ‘antique’ machine man who suffered heavy damage and was sent to be crushed. After refusing to be crushed and helping save Jamie from a Machine Man attack, Spider-Man befriended the robot and introduced him to the Human Resistance, where he helped them try and make counter Earth a better place.

No one is sure how X51 managed to gain thought and feelings, but everyone is glad he did.