NOTE: I will go through this realistically meaning no round one or round two mean that if someone gets a machete to the face during the first 5 fives seconds of a fight they die immediately and also the variations mechanic in the game will not be included meaning that they(or some) will have all their abilities got it okay, lets begin oh yeah one quick thing this will be going over mk9 and mkX.
After the events of Freddy vs Jason,(Before MK9) Jason had finished killing a bunch of teens and was headed back to his cabin Man that girl had got me with that shotgun oh look it healed Jason had thought but there was something he didn't know he did not know that Shang Tsung was watching him for a while now and was interested in putting him in the Tournament but had seen him kill mortals so had to test him"Yes he will be a worthy ally combatant for Shoa Kohn if he is as deadly as I think he is" , so he got 5 tarkatans and summoned Quan Chi to open a portal to the destination of Jason Voorhees (Quan Chi):"Who is this Jason Voorhees Shang Tsung"(Shang Tsung):If I think he is as deadly as I think he is he'll be a worthy outworld combantant recruit"(Quan Chi):"What if he isn't willing to be a recruit"(Shang Tsung):"He'll have to...".
Jason out in the woods stalking a teenage girl she is running trying to get away while Jason is walking towards her she trips on a log when shes trips she looks in his direction he was not there she crawled back into a tree but this tree was somewhat warm not tree warm and it was night and she looks back whimpering she see what she is back against is the hockey masked murderer he shoves his machete easily down on her head while making a scream she stops as soon as Jason stabs her Got you now sleep.
He is going to his cabin a weird thing just instantly in front of his face spawns it is a circle of something with weird colors and out steps Shang Tsung and Quan Chi, Jason instincts kick in and swipes his machete at both but was forcibly stop by the bald white colored guy and the outside of his whole body is stopped, What The Hell I can't move, (Shang Tsung):"I would like you to join us and compete in Mortal Kombat tournament...I can tell you can't talk but if you do I'll bring back your mother, Pamela",Jasons eye widened Mom you hear that he can bring you back , Jason was somewhat not convinced, (Quan chi):"If you think not I'll prove it",Quan Chi resurrected that girl that Jason killed for a moment healing her, she screamed but Quan Chi absorbed her soul, Jason was interested (Shang Tsung):"Are you interested?
Tell me your suggestions of what you want to happen.
P.S based on Devilboy 101 story