Or did he kill them back stage after the filming was over?

Most early cartoon characters have had continual enemies.

Popeye had the Sea Hag and Bluto.

Felix had The Professor and Master Cylinder.

Bugs had less dangerous enemies, but he had more: Yosemite Sam, the Gremlin, Marvin the Martian, Elmer Fudd, etc.

Rocky & Bullwinkle had Boris & Natasha.

All of these enemies became famous

Granted, Mickey was banned by the Nazi, Italian Fascists, and is not considered Kosher by some Islamic leaders, but none of his cartoon enemies came back on a regular basis.

Your thoughts on this important issue, and name your favorite cartoon enemies....ten points for showing appreciation of this aspect of culture...! Thanks!
chris h: We cats don't discriminate. But everybody knows that mice are vermin, and that they were put on the earth for us cats to drag into the house and play with in front of our owners when they're having visitors. Not prejudice; just fact. Meow.