"Masturbation is great for the right arm"

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Cable is not a robot. The metal in his body is actually organic tissue. Ed and I have talked about this a lot. We liken it to a cancer that changes your body's cellular structure. Last time we saw him, his arm had been severed. It's back with a kind of force that will play a major role in this storyline. This is a battle inside Cable's body that he has waged since the first time he appeared.

— Jeph Loeb