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Fenton parents make an invention to reverse a ghost's evil impulses!" It actually brings a ghost's instincts forward. The effects last about two weeks.
The Fentons are in Gotham when they get the chance to use it on Phantom.
Good news: it happens near the Bats, so he's quickly rescued.
Bad news: baby ghost instinct wants parents and turned human to get reassurance. That did not happen and now Red Hood has a crying, keening teenager shaped leech.