Vision volunteers himself to be taken by Ultron in order for the Avengers to track him to his headquarters. But when the Avengers arrive thinking they've finally cornered their greatest foe, Ultron has a villainous surprise waiting for them.

Strange remnants of Ultron's previous experiments create terror on an island where France's main nuclear testing facility exists. The Avengers race to control or destroy these machines before they start a nuclear war. Only they haven't planned on Ultron paying a visit as well.

Dr. Chris Johnson and Falcon's nephew Andrew accidentally release Kang the Conqueror while visiting a museum. Awakened from years of imprisonment, Kang begins to wreak havoc in search of a special crystal obelisk that would allow him to go back into the future and oppress millions of people. That is, if the Avengers don't defeat him first!

After battling Vision, Wonder Man is gravely injured and put on life support. Despite the loss of a team member, The Avengers must assemble to defend humanity from the threat of Ultron. Luckily, the team has found a new ally and member: the Falcon!

With the world at peril, only one team can unite and defeat Earth's greatest threats! Led by the brilliant Hank Pym, the Avengers fight to rid the world of a powerful new adversary as he creates an unimaginable weapon to destroy all of humanity: Vision, the living machine. Follow Ant Man, the Wasp, Hawkeye, Wonder Man, the Scarlet Witch, Tigra and the Falcon as they race to save the human race in "Avengers: United They Stand"!

In London, England's Victorian era, two scientists, Dr. James Xavier and Dr. Nathaniel Essex, hotly debate Charles Darwin's theory of natural selection. Essex believes mutants are the next genetic step forward and begins a bizarre experiment involving mutant evolution. The origin of Mr. Sinister is revealed, as Dr. Xavier attempts to stop Essex before he goes too far.

The battle rages as the Incredible Hulk trades blows with the Absorbing Man across the Nevada desert, and just when it seems like things can't get any worse the Hulkbusters join the fray with orders to take down the Hulk.

It's the final episode! At a Mutant/Human Relations Summit, Henry Peter Gyrich attacks and severely injures Professor Xavier with an energy disruptor. Meanwhile Magneto makes final preparations to take over the world with his mutant army, but on the eve of the invasion Cyclops, Wolverine, and Jean Grey infiltrate Genosha to tell Magneto that Xavier is dying. Magneto halts his plants out of respect to his long-time friend and joins the X-Men as they say farewell to their beloved mentor.

Hawkeye has faced his fair share of super villains in the past, but something doesn't sit right about his last encounter with the Incredible Hulk. Why did the Hulk save his team? And what's going on behind the scenes that Clint doesn't know about?

Professor Xavier receives a call for help from the parents of a new mutant, Sam Guthrie. The X-Men travel down South to visit the new mutant and find that an Army official is planning on using Sam to do his bidding!

In this first episode of the series, Bruce Banner attempts to cure himself of the Hulk but his experiment is shut down by General Ross and Major Talbot. They capture the Hulk and take him to the Gamma Base, where Banner recalls his origin. Suddenly, the Abomination arrives on the scene, sent by the Leader and Gargoyle to capture Banner, and it's up to the Hulk to stop him.

With the emergence of Mary Jane's hydro powers still a mystery, Spider-Man follows Hydro-Man to an underwater lab and discovers that this Mary Jane is actually a clone!

After escaping General Ross, the Hulk meets the Gamma Mutant Warriors and hides out at their base. While there, the Abomination kidnaps Banner and takes him to the Leader. Will Betty and Rick be able to save him before the Leader and Gargoyle find the key to his gamma mutation?

Jubilee and a group of school children are caught in a cave-in while touring a cave on Mansion property. To keep the kids calm, Jubilee tells a medieval fairy tale of knights, princesses, trolls and dragons that strangely resemble some of her fellow X-Men.

Bruce befriends Mitch McCougthen who offers his help to find a cure for the gamma radiation responsible for turning Banner into the Hulk. But when their experiment goes wrong, McCoughten turns into Zzzax, a being of pure energy. Can the Hulk stop him before he destroys a dam?

The Earth's magnetic fields are being disrupted by the Zodiac gang, whose primary objective is to obtain an ancient meteorite buried beneath an island on Earth. With the Earth's survival at stake, the Avengers have a final showdown with the Zodiac gang!

Apocalypse tasks Fabian Cortez with finding him a host body in order to escape the astral plane. Appearing at the wrong place at the wrong time, Jubilee is kidnapped by Fabian Cortez and is taken to the temple for the ceremony. But things don't go as planned when a very angry Beast catches up with the villain.

"Helping Hand, Iron Fist": Bruce Banner goes to Los Angeles to ask Tony Stark for help. Wanting to help his friend, Rick Jones follows Banner and finds himself in the middle of an earth-shattering battle between Iron Man and the Hulk. Will Iron Man and War Machine be able to cure Banner before Gabe Jones and his S.H.I.E.L.D. agents take down the Hulk?

Something is dangerously affecting the magnetic fields of the Earth. Wasp realizes that her father's old business partner, Cornelius Van Lundt, is behind the disruptions. Along with the Avengers, Wasp must face her past in order to save the Earth.

The citizens of Arkon's planet prepare a huge celebration for his wedding to Storm. Meanwhile, after landing on the planet, the X-Men discover that Arkon is a ruthless tyrant with no compassion for his people. With the wedding just around the corner, the X-Men must find a way to convince Storm that the man she is marrying is not who she thought he was.

"Man to Man, Beast to Beast": Bruce Banner travels to Canada to find his old friend, Dr. Walter Lankowski and try to get rid of the Hulk once and for all. But when Bruce finds his friend, a terrible secret is revealed!