Metropolis?

What happens when the Ben 10 team fall through a portal during their fight with Vilgax and end up in another world with the Justice League and the Young Justice. But what if the Justice League mistook our hero's for villains?

This is the best summary I could come up with, sorry it's not that good.

The characters do not belong to me. Ben 10 team belongs to Team Man of Action and the Justice League/ Young Justice belong to Brandon Vietti/ DC