The Avengers: United They Stand
Comes a Swordsman
S1 E4:
The traveling carnival of which Hawkeye used to be a part is behind a series of thefts from a biological weapon study lab. When the Avengers question Hawkeye about his loyalties, he is insulted and leaves. While the Avengers face the thieves, Hawkeye must face his past and his old mentor, the Swordsman.