Mad scientist Mickey has just brewed up a potion; to test it out, he squirts it on a fly that's been trapped by a spider, a (regular) mouse being harassed by a cat, then the cat when Pluto goes after it, and Pluto when dogcatcher Pegleg Pete goes after him. Each of the underdogs turns against his tormentor.
| Directing | Ben Sharpsteen | Director |
| Production | Walt Disney | Producer |
| Visual Effects | Hamilton Luske | Animation |
| Visual Effects | Chuck Couch | Animation |
| Visual Effects | Wolfgang Reitherman | Animation |
| Visual Effects | Bernard Wolf | Animation |
| Visual Effects | Al Eugster | Animation |
