After the defeat of Ultron which was a problem created by Tony Stark they got a new problem , this time again because of Tony . Because of Tony the all the nine planets became unstable which resulted in the instability of all the nine dimensions . Now if this problem is not solved in 48 hours the nine planets will be destroyed starting from Mercury ..... So, one by one they went in all the dimensions through rabbit hole . Every dimension was different. Something happened which changed everything. And, Tony Stark swore that he would not touch anything that he couldn't contain....