Evil Wig is the fifty-first episode of Dude, That's My Ghost! It aired for the first time on December 14, 2013.
When Spencer, on a dare from Billy, swipes Principal Ponzi’s toupee, he thinks it’s just an innocent prank. But as the duo messes around with the hideous hairpiece, Billy makes the mistake of using his ghostly ectoplasm as styling gel, and the wig comes to life. It sets out on a spree of malicious mischief, and ultimately has its sights set on revenge against Ponzi.
Write the plot of the episode here.