Originally Posted by
The Drunkard Kid
He was powerful enough to stomp Dark Raiden with ease and even good Raiden amped by the Elder Gods was fighting an uphill battle against him in MK9.
That being said, MK Kombatants are only mildly superhuman by Marvel standards and there are multiple teams with several individual members who would steamroll Outworld's combined forces by their lonesome and Khan is putting himself smack dab in the middle of metahuman central (edit: so the answer to the question of which superhero comes to the rescue first is "pretty much all of them"). Sans PIS, there are days where invading Marvel New York City would be a tricky venture for Thanos if everyone is unoccupied, and that's if there isn't a Phoenix Force Bearer on Earth this week.
Speaking of which, both the X-men and Doctor Strange, at least, have more or less faced this exact situation multiple times, only with much more powerful opponents.