One of the biggest draws of the recent Mortal Kombat games has been the scope. While the likes of Trilogy and Armageddon felt confined to a singular, albeit massive war on one Earth, MKX and MK11 really leaned hard into bending the fabric of space and time. As such, it became clear realities in future series entries would collide in due time.
Source:https://www.cbr.com/mortal-kombat-1-flashpoint-endgame/