The Dup-O-Matic is a piece of technology first featured in Steve Troop's webcomic Melonpool and later seen in It's Walky!. A raygun created by Ralph Zinobop, it duplicates whatever it hits, but the resulting duplicate is the exact opposite of the original subject.

In an effort to escape from Head Alien's forces, Ralph turned the Dup-O-Matic on the Aliens, creating Anti-Joyce and Anti-Head Alien in the process.

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