S1·E37 Invasion of the Tweedle Snatchers

When the Cheshire Cat commandeers a remote-controlled toy flying saucer, the Mad Hatter and the March Hare think that Wonderland is being invaded from outer space. The Hatter and Hare manage to get most of Wonderland in a panic, until finally, everyone discovers that there are no little green space invaders, just a big, purple, mischievous cat.