Through the non-canon dark side ending of The Force Unleashed II, the events at the Battle of Endor were drastically altered as a consequence of the Rebel defeat at Kamino and Starkiller's choosing of vengeance. Although much of the battle was similar to its canonical counterpart, the main difference was in the form of Darth Vader's Dark Apprentice, the Dark Lord's personal Sith assassin and the only perfect clone of the original Starkiller. With orders from Vader to prevent the Rebel forces from destroying the shield generator bunker, the apprentice did not hold back from rampaging his way through the forest, slaughtering Rebel troops and Ewoks alike.
Upon reaching the entrance of the bunker, the Dark Apprentice's path was blocked by the Rebel Han Solo and the Wookiee Chewbacca. While standing above the bunker with a rocket launcher, Solo warned his friend that the clone was approaching and that they had to do everything that they could to buy the Jedi Princess Leia Organa more time to complete the mission. To aid in their effort, Chewbacca utilized a commandeered Imperial AT-ST Walker. Although a combination of the Walker's heavy firepower and quick shots from Han Solo was able to stall the apprentice, neither Solo or Chewbacca were able to kill the clone.
After suffering damage to the Walker, Chewbacca called upon the aid of the Ewoks. Once more, their tactics proved ineffective against Vader's disciple who managed to kill the native creatures while simultaneously warding off shots from Solo and Chewbacca. After inflicting even more damage to the Walker, the clone wasted little time in maneuvering his way over to the top of the Walker. Once the hatch was open, the clone began pulling its Rebel occupant out of the cockpit. Chewbacca attempted to resist by relying on his own brute strength, but was effectively incapacitated by the apprentice with one swift punch to the face. Unable to resist any further, Chewbacca was rendered helpless as the clone raised and held the Wookiee by the throat with one hand.
Solo attempted to save his friend by firing two shots at the clone. But the Dark Apprentice anticipated this action and quickly used the Wookiee as a body shield to absorb the attack, thus causing Solo to inadvertently kill Chewbacca. With Chewbacca dead, Han Solo quickly followed as the clone impaled the former smuggler through the chest with a lightsaber. Their failure to kill or prevent the Dark Apprentice from entering the bunker led to Leia's death at the hands of the Dark Apprentice and the Empire's decisive victory over the fallen Alliance.