Repair crab

Repair crabs are Transformer technology in the Generation 2 portion of the Generation 1 continuity family.

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Repair crabs aid in a Transformer's repair, scuttling over the surface of the body reactivating disabled components. The unnamed crab-shaped technology is attached by lengths of cable to much larger machinery.

Fiction

Marvel Comics continuity

Generation 2

After Optimus Prime was damaged severely in battle by Megatron, repair crabs worked to restore his body. Tales of Earth, Part Four