Hitler Cat was an evil megalomaniacal feline bent on world domination. First, he was to destroy all of the mice, but then I said nothing. Then, he was to destroy all the birds, but I said nothing. Next, he would do away with all the dogs, but still I said nothing. The final phase (or solution) of his maniacal plans was to be the enslavement, torture, or deaths of over seven billion humans.
He's so cute! Wook at his tiny moustache face! Wook at heem! Who'se an adowable dictator? You are! Yes, you are!
Luckily, he was killed by his Awesome brother, a time-traveling Dude with attitude, and prevented this horrific alternate reality from ever coming to pass.