Danny Phantom (2004)

S1E20 Control Freaks

When Sam's overly cautious parents prohibit her from going to the bizarre Goth circus that arrives in town, she decides to defy them. Unbeknownst to her, the performers are actually spirits manipulated by the eerie ringmaster, Freakshow, who exploits them to steal from the town. When Danny succumbs to Freakshow's enchantment and becomes part of the circus and its thievery, Sam must secretly work to shatter Freakshow's enchanted crystal ball, rescue Danny, and face her parents' wrath when she's inevitably grounded.