4 Reasons Why Ultron Could Return in 'Avengers: Endgame'
As Endgame plans to launch on April 26 with a near three-hour runtime, there's likely to be tons of action and story to keep everyone on the edge of their seats. Because of the lack of knowledge provided, information can only be speculated based on the trailer and teaser on what will happen. Theories from time travel to Tony Stark's death, one theory that I want to mention is the return of Ultron, who was the MCU's big bad in the second Avengers film. From the appearance of Marvel's characters to subtle hints in MCU films, here are some reasons why Ultron could come back. This is all speculation and has not yet been proven.