"Kang Dynasty", sometimes called "Kang War", is a 16 part comic book storyline which ran through Avengers #41–55 and Avengers Annual 2001 between June 2001 and August 2002. From Wikipedia
Season 2, Episode 4's cliffhanger ending revealed as direct consequence of Sylvie's actions in Season 1; Head writer Eric Martin provides insights on overarching theme for season 2 and introduction of new characters.
