Ultron returns after his apparent demise and seeks revenge on the Avengers. Ultron plans to replace humanity with robots. The Avengers must defeat him as well as new threats like Baron Zemo’s Masters of Evil and Kang the Conqueror. The Masters of Evil consist of Beetle, Goliath, and Screaming Mimi. Vision, Black Panther, Captain Marvel, Ms. Marvel, and the Inhumans will also be appearing this season. The storyline is expected to set up an adaptation of Civil War.
Avengers Assemble is an American animated television series based on the fictional Marvel Comics superhero team known as the Avengers. It has been designed to capitalize on the success of the 2012 film, The Avengers. The series premiered on Disney XD on May 26, 2013 as a replacement for The Avengers: Earth’s Mightiest Heroes.
It airs alongside Ultimate Spider-Man, Hulk and the Agents of S.M.A.S.H. (until its own conclusion on June 28, 2015), and Guardians of the Galaxy as a part of the Marvel Universe block. It features a near-identical cast and crew with both shows and a shared continuity with them. Joe Casey, Joe Kelly, Duncan Rouleau and Steven T. Seagle are in a group known as Man of Action. They have been confirmed to be the executive producers of the series.