Danny Phantom (2004)

S2E7 The Fenton Menace

Danny Fenton's behavior is raising red flags for his sister Jazz, who suspects he might be losing his grip on reality. Unbeknownst to her, Danny is actually being haunted by a vengeful spirit named Youngblood, invisible to adults and especially to Jazz, who believes she's the voice of reason. In an effort to unplug the family, Jazz organizes a camping trip without any ghost-hunting gadgets. However, Youngblood tags along, launching a series of mischievous pranks that not only make Danny appear unstable but also jeopardize the safety of the entire Fenton family.