Cosplay Day
- Episode aired Mar 15, 2020
![Ben 10 (2016)](https://m.media-amazon.com/images/M/MV5BNWZiM2Q1MzYtMDc5Zi00Y2YzLTkxODktNzM0NGM5NzhkMWU3XkEyXkFqcGdeQXVyMTMwNTg5NDc0._V1_QL75_UX190_CR0,2,190,281_.jpg)
Team Tennyson enjoy the biggest convention in town, but when a gawky costume store employee finds a familiar-looking helmet in the back of the store and tries it on, Ben is faced with the re... Read allTeam Tennyson enjoy the biggest convention in town, but when a gawky costume store employee finds a familiar-looking helmet in the back of the store and tries it on, Ben is faced with the return of an old foe in a new form: Forever Knight.Team Tennyson enjoy the biggest convention in town, but when a gawky costume store employee finds a familiar-looking helmet in the back of the store and tries it on, Ben is faced with the return of an old foe in a new form: Forever Knight.