just go on youtube. the masters of evil return, with new members grey gargoyle, chemistro, and living laser. loki takes over 8 of the nine realms and reveals he was the mastermind behind the breakout, the masters of evil, and pretty much the reason for the formation of the avengers. iron man gets an uru metal suit, cap touches the cosmic cube, and bucky is sent to the modern era alive. ultron nearly kills thor, but he is found to be alive in the next episode. the serpent society make their debut, as do malekith and ulik. then as the season comes to a close, captain america is taken out by a skrull, and then replaced by him(secret invasion anyone), oh, and nick fury and mockingbird disapear, leaving maria hill to take over S.H.I.E.L.D. and threaten the avengers with the choices of registering, or fighting the government(the 50 state initiative).