I do not own any characters, all characters are owned by Mortal Kombat and Marvel
This Avengers lineup is based off the most current 2019 series version, not the movies or famous popular line ups. Also my knowledge of Mortal Kombat is limited so please forgive any inconsistencies with the exact story or character details.
White Lotus Temple
Shang Chi lay helpless beneath the boot of Shao Khan. With Liu Kang now dead and residing in the Netherrealm Shang Chi was chosen as the new champion of the White Lotus and therefore it was his burden to stop Shang Tsung from opening the portal but he was overwhelmed by Shang Tsung's armies. Beaten and bleeding he looked up as he rolled away from Shao Khan and saw the mighty fighters before him. Motaro the centaurion powerhouse, Scorpion the burning wraith of vengeance, Sheeva the might Shokan warrior, Reptile the Saurion ninja, Khotal Khan the godly Osh Tek king, Baraka the savage Tarkata, D'vorah the insect queen, Skarlet the blood witch and of course Shang Tsung the evil sorcerer and his master Shao Khan the almighty warlord.
Shao Khan lifted Shang Chi and said "any last words before I consume your soul"? Shang Chi coughed and said "I was an Avenger once. Once an Avenger, always an Avenger". "He has lost his mind, he is speaking incoherently" replied Shang Tsung, however with his last strength Shang Chi yelled out "Avengers Assemble" dramatically but there was nothing but silence. Shao Khan threw Shang Chi to the ground and summoned his wrath hammer but as he lifted it Shao Khan and his warriors were taken aback by the a beam of light teleporting the Avengers before the outworld warriors.
The outworld warriors took to their fighting pose awaiting for instruction, Shao Khan looked to his second in command and yelled "Shang Tsung, what is the meaning of this. You never spoke of these Earthrealm warriors" to which Shang Tsung replied "I know not who they are, they have reamined hidden from me". Shao Khan snarled in rage and raised his hammer drawing the Outworlders to fight.
The Avengers stood poised and Iron Man said "So how we gonna play this one out Cap" and Captain America responded "Don't you remember, we all agreed on Black Panther as our leader. T'challa you make the play". Black Panther momentarily scanned his surrounding and said "We seem quiet fairly matched, pick a target and fight