Zombozo (Classic)

Zombozo
Zombozo is a vampire-like clown that feeds on the happiness of others. Dressed in appropriate attire, he stages shows to bring people in and then uses a machine he calls the "Psyclown" to drain the happiness and life energy from them, leaving them depleted and sad. In the most extreme cases, it even seems to age people. During all this, his minions strip the town of all its valuables. He was eventually defeated when Ben overcame his fear of clowns and terrorized Zombozo as Ghostfreak by peeling back his skin, causing him to explode in a burst of confetti. He hasn't been seen since his defeat.

While Zombozo's henchmen reappeared in a future episode, he himself did not. The three indicate that they have not seen the clown since his defeat.