Not Seeing is Disbelieving (Japanese: ペコラは透明人間)

Pecola accidentally touches a switch in Dr. Chu's Lab and makes himself invisible. And while Dr. Chu adjusts the machine to reverse the process, Pecola is off to have some fun with the residents of Cube Town. And it is fun until he causes a lovers' spat between Hillary and Gazelle. Now he's got to try and fix the situation. Not so easy when no one can see you, and it's not until Dr. Chu's machine materializes Pecola that everyone believes him.