History
Gotham City was struck by a series of feline-related crimes, perpetrated not by the now-reformed Selina Kyle, but by a costumed criminal known as The King of Cats, a cunning mastermind whose theme revolves around cats. The King of Cats sends flowers to Kyle, causing Batman to investigate her involvement. He soon becomes convinced that she is innocent, but asks her to aid in arresting the King of Cats. Selina, however, refuses after realizing that the King of Cats was her brother Karl. The King of Cats attempts to lure Selina out of her retirement and back into a life of crime. He is easily captured by Batman and Robin, but Selina pleads with Batman to let him go. When Batman refuses, she knocks him out and allows her brother to escape. Selina asks her brother to end his criminal career and turn himself in, and he promises to consider the offer. Shortly after, Batman attacks the King of Cats at the zoo and in the following battle, both are thrown into separate tiger pens, each trapped without one being able to aid the other. Catwoman, in her old costume, arrives and saves both from certain doom. The King of Cats is remorseful over his crimes, and he promises to abandon his criminal ways and turn himself in.
After several years in prison, Karl was paroled. He remained free on his parole, and was glimpsed in Superman Family #211 walking Selina down the aisle when she wed Bruce Wayne. -This Bronze age appearance firmly establishes the King of Cats as an Earth 2 character.