Attacked by Next Avengers
So later in the future, They stumble upon Next Avengers, who attack them, explaining the thing that Kang was trying to communicate and the defeat of Ultron. And then they again go back in time.
Ask Ultron to spare Kang
They again go back in time and before having a war with Ultron, ask Ultron to let the Kang win this time. After solving this predicament, They communicate with Next Avengers which includes Iron Man and Hulk, telling them about how the situation was solved.
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