Ben 10 (2016) (2016)

S4E14 Cosplay Day

Title: Cosplay Spectacle Plot: The Tennyson team revels in the excitement of the town's largest convention. However, things take a turn when an awkward employee from a costume shop discovers a helmet that looks eerily familiar. Upon trying it on, Ben finds himself confronting a revived adversary, the Forever Knight, who has returned with a fresh twist.