Ben 10 (2005)

S2E11 Ghostfreaked Out

Ben is already on edge due to a haunting nightmare involving Ghostfreak when a tour of a prestigious academy, which Gwen is eager to join, takes a chaotic turn. The unsettling appearances of the eerie alien, along with the mischief caused by Acid Breath, Frightwig, and Thumbskull, only heighten the tension of the day.