Garth was a henchman of Emile Dorian.
History
A subject of Dorian's splicing prior to the creation of Tygrus, Dr. Dorian did admit his experiment on Garth was "quite crude".
Garth abducted Selina Kyle for experimentation, finding her visiting the Gotham Zoo. He also callously knocked a zoo employee into the tiger pit to avoid witnesses.
Later, in Dorian's island mansion, Tygrus was practicing for his forthcoming fight with Batman, whereas Garth was seen firing shots at Tygrus.
When the fight between Tygrus and Batman culminated into Tygrus destroying Dorian's laboratory, Garth was knocked out in the carnage. When Selina fled the fire, Batman was seen hoisting an unconscious Garth away.
After Dorian was arrested and his base destroyed, Garth was arrested.
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