Little Billy is the twenty-seventh episode of Dude, That's My Ghost! It aired for the first time on May 11, 2013.
When Billy finds a miniature action figure of himself in a flea market, he puts ectoplasm on it as an alternative for hair gel and accidentally turns it into a voodoo doll. The situation is only made worse when Principal Ponzi gets his grubby hands on the action figure.
Write the plot of the episode here.