Mr. Hyde appeared in the Elseworlds Daredevil/Batman: Eye for an Eye crossover book. Two-Face partnered with Mister Hyde for a series of technological robberies. In truth, Two-Face had implanted Hyde's brain with the material needed to "grow" an experimental "organic" computer chip, and fed Hyde pills to keep him enraged. Once grown, the chip would kill Hyde, its current growth also weakening Hyde's strength as his energy is diverted to support the chip (Batman noting during the fight that Hyde should normally have a punch that could knock Superman into orbit). Hyde berates Two-Face, proud he has abandoned his past as Zabo and insults Two-Face for hanging onto his Harvey Dent side, as well as using a coin to decide between right and wrong. Two-Face is glad the process will kill Hyde. In the end, Daredevil uses his past friendship with Dent to talk Two-Face into supplying the antidote for the chip, which saves Hyde's life.