Warning: I'm putting some of my ideas in the story.
The Cataclystem- the end of the world- has hit Azeroth badly- earthquakes, tidal waves, volcanic eruptions- and Warchief Thrall- leader of the Horde- has left to find out why and to stop it. He left Garrosh Hellscream- son of Grommash- in charge, but Garrosh was head strong and bent on conquest. The future of the Horde depended on warriors like Grimar- Garrosh's half-brother (who I made up)- and Ma'ka- a troll witch doctor in-training. The two became friends after they met in Sen'jin Village and they stopped the Alliance invasion of the village. Together the orc-human hybrid and the troll joined the many battles and fought many enemies across the western continent of Kalindor- Alliance, Rasemore, Night Elf, Naga, even the Burning Blade cultists. Ma'ka even stood by his friend at Cliffwalker Post, in Stonetalon Mountains, there Grimar lost all his honor by helping Overlord Krom'gar with his bomb. Now the Krom'gar General insigna, was his mark of shame.
However the two had to go their separate ways, when Grimar finally reclaimed his honor by winning the war with Night Elf's, after that he journeyed to the Warsong Hold in the Borean Tundra and challenge the Warsong clans current leader- Gargok- to mak'gora for leadership of the clan. Ma'ka returned to the Echo Isles to finish his witch doctor training. After he was done and became a full fledged witch doctor, Ma'ka was sent to Orgrimmar to aid the people after an earthquake hit the city. It was unheard of that a troll became a witch doctor at such a young age- Ma'ka was fifteen, had blue skin like all Jungle Trolls, and green hair. Ma'ka was special.
In Orbit Over Azeroth
The Republic cruiser- Resolute- had just arrived to a newly discovered planet. The Cataclystem was blasting energies across the galaxy at light speed, a trading station on the edge of known space detected it. When the Jedi Counsel found out, they sent Anakin Skywalker and his padawan Ahsoka Tano to investigate. The Jedi didn't know what was out in the Unknown Regions, so the Resolute was sent. When it arrived at the source of the energies, they discovered a planet that had three continents (I'm not adding Pandaria yet), two oceans, and multiple biomes. There were also high technology readings, but they were sparatic at best," must be a primitive planet "Ahsoka thought.
As the ship entered the planets atmosphere, the Resolute scanners detected something coming… fast," sir, incoming bogey "one of the clones stated. Anakin couldn't sense anything coming , then again he nor his padawan couldn't sense anything at all. Something was blocking their connection to the Force. Skywalker looked out the view port to see a creature flying toward the ship, the Jedi Knight had a bad feeling about this. "All batteries open fire!" he ordered, the ships turbo lasers fired at the unknown creature with no avail, it ether dodged the lasers or deflected them off it's body. As it got closer, they saw that it had a dark metal skin. Then breathed fire on the cruiser knocking it out of the sky. Only a few made it off the ship.
The escape pods and the gunships ships across Kalindor. The Twilight crashed not far from Orgrimmar. Garrosh sent a scouting party to investigate lead by Overlord Saurfang and Ma'ka, when they got to the crash site, they found an odd looking metal structure. When the group went inside, they found only two survivors- a human and an orange skin female (they didn't know what she was) – they took them and the wreckage back to Orgrimmar. The salvage was sent to the Goblin Slums to be studied, while Ma'ka and the other healers worked on the survivors. As soon as the two woke up, they were taken to Warchief Garrosh.
As the two Jedi were escorted by the Korkron- the Warchief's personal guard- through the streets of Orgrimmar, the people gave Anakin harsh glares- most of the races of the Horde suffered horribly at the hands of humans, when they arrived at Grommash Hold, the Jedi Knight and his Padawan saw who looked like a "Warchief"(the orc-the name they learned from the Krokron- who sat on the throne)- he had brown skin, markings on his skin, and a bald head," who are you trespassers" Garrosh demanded. Anakin stepped forward "I am Jedi Knight: Anakin Skywalker and this is my Padawan: Ahsoka Tano", "what are 'Jedi'?" Anakin explained what Jedi are- the peacekeepers of the Galactic Republic, then he explained what the Galactic Republic was- a great galactic power- to Garrosh and his advisers.
Garrosh could tell something was… off in this "Jedi's" voice, but he didn't know what though. The two were aloud to stay in Orgrimmar until their ship was repaired and their surviving crew members were found. Their ship and weapons would be examined by the Hordes top engineers.
A Few Weeks Later
Ahsoka had become part of the Horde. She had learned the languages of the different races, she had learned how to hunt from the Tauren, and she had become more Togurta than a Jedi. Ahsoka had also become close friends with Ma'ka (more so than you think), but the citizens of Orgrimmar gave Anakin nothing but venom. Little did they know, but the people of Azeroth would need the aid of the Jedi in the many battles coming ahead.