Heihachi was spending his free time relaxing as Kuma was apparently playing, rolling back and forth on his back, when suddenly, a loud scream filled the room, alerting both fighters and causing them to brace themselves in whatever way they could, Heihachi merely being able to stand his ground in an Akuma-like stance, Kuma having to dig his claws into the floor. Sindel finished screaming and walked up to Heihachi stopping about 5 feet away. "So, you are the old fool Shao Kahn has sent me to destroy. You're certainly more spry than I'd imagine. That scream blows most others away with ease." She said.

"Someone has a death wish." Heihachi growled, preparing to battle. "I consider myself a chivalrous man, but I do not tolerate attacks on my home." He said.

Kuma prepared to rush in to aid his master, but was stopped when he was grabbed from behind by Goro. "Not so fast." The Shokahn said, struggling with the bears weight and fell back, hurting both of them, but getting them in their own battle.

"It is between us now." Sindel said, taking up her fighting stance.

"Excellent." He said, rushing in.

He threw a strong punch at her, which she managed to block, but it sent her back a few feet. He reengaged, throwing a fast and strong combo Sindel could do little against except block or dodge. She managed to jump back and then shot her hair out like a snake, wrapping it around Heihachi's neck and throwing him into a wall, crashing through it. He growled and started to get up, then rolled out of the way as she tried to slam her heel down where his head was. He swept her off her feet, getting up and repeatedly bringing his arm down on her, but she continued to keep her guard up. She used an opening between one of his hits to shoot a scream fireball into his face, causing him to stagger back, unleashing her own combo which she finished with another loud scream to blast the Patriarch of the Mishima clan back and onto the floor.

"Impressive." He said, getting up.

"I slaughter my opponents by the dozens with ease. You stand no chance." She said.

"Arrogant fool! I am Heihachi Mishima! And this world will be mine!" He said, rushing in again, breaking her guard with a flying kick and hitting her with a devastating combo. He finished by kicking her in the stomach and knocking her to the floor, about to stomp on her, but much as he did before, she rolled out of harm's way, firing a low fireball to make him lose his footing and balance, then sent him into the air with an uppercut, then kicking him in the chest with a side kick as he started to fall to the ground, sending him into a wall.

"Give up, old man. You are weak." Sindel said, condescendingly.

"I'm not finished yet!" He said, getting up and charging at her once again. She shot a low fireball at his feet again, but he jumped over it, landed and spun, hitting Sindel in the left temple with a backfist strike, then delivered a strong uppercut, launching her into the air, continuing to hit and juggle her in the air, slamming her against a wall and smashing his fist into her stomach, knocking the air out of her and winning him the fight.

After a few hours, the Empress of Outworld awoke, finding herself chained to a rocket ship. She struggled, but the chains held her firmly in place. All she could do was scream in terror as the rocket ship flew off into deep orbit. At the same time, on the ground, Heihachi was looking through his binoculars, watching as she left orbit, laughing triumphantly.

Reasons for the outcome:

1: Sindel may be more maneuverable than Heihachi, but he has every other advantage. He is much stronger, able to easily smash through waves of JACK's, climb up a giant pitfall Kuma sent him down, kill an immortal person and catch bullets with his teeth. He is also more durable, surviving getting thrown off a cliff and getting blown up by a JACK settining off a bomb in his face, which sent him flying into a boulder.

2: Heihachi's strength would put him at a huge advantage in close combat, as well as his large combos. Sindel's best bet would be to stay at a distance, but Heihachi would be able to clear the distance fairly easily.

3: Heihachi is a tactical fighter, seen in Tekken 6 as he planned to wait on the sidenlines as Jin and Kazuya would tear each other apart, then come in and finish them himself, also coming up with dozens of convoluted plans on finishing his enemies. We see in Mortal Kombat 9 that Sindel just uses brute force to (effectively) destroy her opponents, which backfired in the end against Nightwolf.

4: This may be debatable, but Heihachi claims the only person that can defeat him is another person carrying Mishima blood. I did not use that in the fight, but that may be something to consider.

5: Heihachi's combos are much longer and more damaging than Sindel's and in the movies, he tends not to stop brutally attacking until he is interrupted or his opponent is down, such as when he kept attacking a floored Jin, or juggling Kazuya into the air and slamming him into a wall and punching him in the stomach to take him down.