...And None Shall Survive

...And None Shall Survive is the twenty-second episode and season finale of the second season of ABC's The Avengers. The episode first aired on May 17, 2012 and was written by Joss Whedon.

Synopsis
As the war between Mutants and Humans reaches a boiling point, Hydra reintroduces itself and initiates its own plan.

Plot
Tony Stark, Steve Rogers, Clint Barton, Sam Wilson, and Bobbi Morse are taken onto a Hydra truck and driven away. Barton refuses to believe Natasha Romanoff would turn on them, but the others are more believing. Romanoff walks away and shapeshifts back into Mystique, telling Magneto they have five Avengers out of their path. On the Helicarrier, the real Romanoff attempts to find Barton, until she runs into Thor, who saw her kidnap the Avengers, and imprisons her. Meanwhile, Hank Pym and Janet van Dyne apply his new technology to their suits and escape their lab, but Magneto, Wanda and Pietro Maximoff, and Avalanche enter and force them to create a stabilizer for Wanda's abilities. At Hydra, Bruce Banner is placed into a cage, which not even the Hulk can break open. Madame Hydra reveals she wants her super-powers and is going to create a serum using his and Rogers' blood. Banner tries to tell her it won't work, but she refuses to listen. The Avengers arrive and all except Rogers are taken to separate cells. Rogers is brought to the Madame, who orders a blood lab to be taken from him. Thor begins taking out Magneto's lackies and Romanoff pleads with him to release her. Mystique, still disguised as Romanoff, enters again and Thor debates what to do. The real Romanoff tells him information only she would know and Thor blasts Mystique with lightning, sending her flying out the Helicarrier window, before releasing Romanoff.

Main

 * Timothy Olyphant as Tony Stark/Iron Man
 * Justin Hartley as Steve Rogers/Captain America
 * Chris Hemsworth as Thor
 * Matthew Gray Gubler as Bruce Banner/Hulk
 * Michael C. Hall as Hank Pym/Ant-Man
 * Evangeline Lilly as Janet van Dyne/Wasp
 * Katie Cassidy as Natasha Romanoff/Black Widow
 * Mike Vogel as Clint Barton/Hawkeye
 * Anthony Mackie as Sam Wilson/Falcon
 * Adrianne Palicki as Bobbi Morse/Mockingbird
 * Cobie Smulders as Maria Hill
 * Denzel Washington as Nick Fury

Guest cast

 * Elizabeth Olsen as Wanda Maximoff/Scarlet Witch
 * Sarah Michelle Gellar as Jean Grey
 * Milo Ventimiglia as Scott Summers
 * Jake Weary as Bobby Drake
 * Odette Annable as Mystique
 * Aaron Johnson as Quicksilver
 * Danielle Nicolet as Pepper Potts
 * Abigail Spencer as Ophelia Sarkissian
 * Devon Bostick as Avalanche
 * Kyle MacLachlan as Magneto

Previously on...

 * Wanda has a change of mind about her side on the war.
 * Magneto and his team infiltrate the Hellicarrier.
 * Clint and Bobbi are proposed with a new assignment.
 * Bruce is kidnapped by Madame Hydra.
 * Mystique impersonates Natasha and captures Tony, Steve, Clint, Sam, and Bobbi.

Trivia

 * Critical reception to episode was positive. IGN gave the finale a 8.1/10 "Great" rating, The A.V. Club graded it a B+. Additionally, Vulture awarded the episode 4 out of 5 stars. Elizabeth Olsen was considered a standout for her performance.
 * 12.63 million U.S. viewers watched the episode live, while it received a 4.2 rating in the 18–49 demo, making it the third highest-rated program of the week, and the highest-rated scripted broadcast.