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EW can confirm that Justice Leak (Powers) has been cast in the role of the villainous Hellgrammite, an alien that Supergirl will be chasing in the CBS drama’s freshman series.
In the comics, Hellgrammite is actually entomologist Roderick Rose who, thanks to some experimentation, is transformed into the insect-like villain who draws his name from the actual hellgrammite bug. Hellgrammite’s comic-book powers include super-strength, improved jumping — or hopping, in this case — and can produce cocoons to imprison foes or even transform them into larvae versions of himself. Those with an aversion to bugs may not want to look too deeply into the character’s origins.
From Entertainment Weekly: