Introduces Natasha Romanov, discusses how she became known as Black Widow, and shows how she contributes to the Avengers and S.H.I.E.L.D.

Introduces Sam Wilson, discusses how he became known as Falcon, and shows how he contributes to the Avengers.

Wolverine may be one of the toughest X-Men, but he's about to meet his match -- the sinister Sabretooth! Can the unstoppable Wolverine beat a mutant with the same sharp claws and healing powers?