Mission to Malachor

In the third year before the Battle of Yavin, Kanan Jarrus, Ezra Bridger, Ahsoka Tano, and the astromech droid Chopper went on a mission to the planet Malachor to seek knowledge that would help them defeat the Sith and their Inquisitors. During the course of their mission, the rebels came into conflict with the Inquisitors but were aided by an unlikely ally: the former Sith apprentice Maul. Joining forces, Maul and the rebels worked together to obtain a Sith holocron and to plant it in the Malachor Sith temple's obelisk.

However, Maul then turned on his Jedi allies and blinded Kanan. The rebels' problems were further complicated by the arrival of the Sith Lord Darth Vader, who had come to take the secrets of the temple for himself. Together, Kanan and Ezra managed to remove the holocron from the temple's obelisk, which triggered an implosion that damaged much of the temple. While the two Jedi managed to escape on the Phantom with Chopper, Ahsoka stayed behind to hold back Vader. While Ahsoka was believed to have died, she and Vader had in fact survived the implosion.

Prelude
Before the mission occurred, the Jedi rebels Kanan Jarrus and Ezra Bridger had been hunted by the Seventh Sister and the Fifth Brother; making it nearly impossible for them to help the rebellion to establish a base. Seeking answers, Kanan and Ezra along with the former Jedi Padawan Ahsoka Tano traveled to the Jedi Temple on Lothal to seek answers from Master Yoda. While Yoda counseled the Jedi against fighting the Galactic Empire, Ezra was determined to continue helping the rebellion. Yoda then advised Ezra and his companions to travel to the planet Malachor. Millennia earlier, the planet had been the site of a great battle between the Jedi and the Sith which had ended in both sides being destroyed.

After helping the Phoenix rebel cell to establish Chopper Base on the planet Atollon, Kanan, Ezra, Tano, and Chopper traveled on the Phantom to Malachor. Despite Rex's offer to assist them, Ahsoka insisted that this mission was for the Jedi alone. She believed that the planet contained "forbidden knowledge" that would help them to defeat the Sith and their Inquisitors.

Getting separated
As the Phantom descended into Malachor's atmosphere, Chopper picked up an unidentified second ship. The Jedi and Tano quickly realized that they were not alone in seeking the forbidden knowledge on Malachor. This second visitor turned out to be an Inquisitor known as the Eighth Brother, who was pursuing a "shadow" which later turned out to be the former Sith apprentice Maul; an enemy of the Sith Lord who ruled the Empire. While Chopper tracked the second ship, the Jedi and Tano inspected a ring of monoliths that were inscribed in an unfamiliar "ancient tongue".

After Ezra accidentally touched one of the monoliths, the ground beneath the three travelers collapsed. The Jedi and Tano quickly found themselves in an underground tunnel and sighted a large pyramidal Sith temple ahead. While passing through an ancient battlefield littered with ossified bodies and lightsabers, the travelers were ambushed by the Eighth Brother. During the ensuing skirmish, the Inquisitor fired three blaster bolts with his double-bladed spinning lightsaber, causing the ground beneath Ezra to collapse and separating him from Ahsoka and his master.

While Ahsoka and Kanan pursued the Eighth Brother, Ezra tried to find his way out of the tunnel. Shortly later, he encountered Maul who called himself "Old Master". While Bridger was initially distrustful of the stranger and rightfully suspected that he was a Sith, Maul managed to win the boy over by telling him that he was seeking the same knowledge in order to avenge the crimes that the Sith had perpetrated against his late mother and brother. Ezra was able to sympathize with Maul's plight due to his own grievances against the Empire for taking away his home and parents.

Together, the two Force-wielders managed to force their way through the Sith temple. After a challenging trial involving Force powers and trust, Ezra and Maul managed to obtain the Sith holocron. Meanwhile, Kanan and Ahsoka managed to captured the Eighth Brother with the help of Chopper, who used the Inquisitor's own TIE Advanced v1 starfighter to blast him to the ground. Together, Kanan and Ahsoka led their captive to the Sith temple, but were soon ambushed by the Eighth Brother's comrades: the Fifth Brother and the Seventh Sister. The Jedi and Inquisitors engaged in a lightsaber duel.

A temporary alliance
At that point, Maul and Ezra stumbled upon the two opposing parties. Using his lightsaber, Maul helped Kanan and Ahsoka to drive the Inquisitors away. While Kanan and Ahsoka distrusted Maul due to his past record, Ezra argued that Maul could be trusted and recounted how they had worked together to obtain a Sith holocron. Following a tense meeting, Maul managed to convince Kanan and Ahsoka to work together by pointing out that the Inquisitors would have alerted Darth Vader to their presence. Maul then tricked his Jedi allies into helping him carry out a plan to plant the holocron in the temple's obelisk; claiming that it would give them the knowledge to destroy the Sith.

Believing that Maul intended to destroy the Sith, the Jedi and Ahsoka agreed to assist his mission. While Ezra was convinced by Maul, Kanan still harbored his suspicions of the former Sith. As the four travelers climbed the obelisk, Kanan took the opportunity to pull Ezra aside and warn him that Maul could not be trusted. Ezra in turn accused Kanan of holding him back and responded that Maul knew his potential. On the way up, the two Jedi were ambushed by the Eighth Brother, who knocked out Kanan and attempted to steal the Sith holocron. Before the Inquisitor could harm Ezra, Maul arrived at an opportune moment and drove off the Inquisitor.

With the Inquisitors after them, Maul convinced the Jedi and Tano to split up. Despite Kanan's objections, Ezra decided to accompany Maul to the top of the obelisk. During the journey, Maul took the opportunity to sow discord between the Padawan and his master. Shortly later, they were attacked by the Seventh Sister and her ID9 seeker droids. Fighting together, the Jedi and former Sith managed to dispatch the seeker droids and overpower the Inquisitor. While Maul held the Seventh Sister suspended in mid-air, he encouraged Ezra to kill her. When Ezra refused, Maul killed the Inquisitor himself and chided the Jedi for his hesitation.

Maul then told Ezra to continue alone to the top of the obelisk while he went to the aid of Kanan and Ahsoka. Arriving at the scene, Maul took on the Fifth and Eighth Brother. Ahsoka managed to slash the Fifth Brother's lightsaber, causing him to drop it and allowing Maul to kill the Inquisitor with a slash through the torso. Meanwhile, Kanan managed to damage the Eighth Brother's lightsaber. The surviving Brother then attempted to flee using his spinning lightsaber to fly, but the weapon malfunctioned and the Inquisitor plummeted to his death below. Having eliminated the Inquisitors, Maul then turned on his Jedi allies.

Showdown with Darth Vader
When Kanan demanded to know where Ezra was, Maul took the opportunity to blind the Jedi Knight with his lightsaber. Before Maul could finish off Kanan, Ahsoka attacked him with her white lightsabers. During the duel, Maul revealed that the temple was actually a powerful battle-station capable of destroying all life and that he planned to use it to exact his revenge on all his enemies. Despite being blinded, Kanan managed to muster enough energy to don a Jedi Temple Guard's helmet and came to Ahsoka's aid. After telling Tano to find Ezra, Kanan managed to throw Maul off the edge of the temple. He then contacted Chopper and told the astromech droid to bring the Phantom to pick them up.

Meanwhile, Ezra managed to plant the holocron in the temple's obelisk. He was immediately greeted by a female entity known as "Presence", who revealed the temple's true function. When Ezra expressed revulsion, Presence told the young Jedi that she would instead share the power with someone else more worthy. At that moment, Darth Vader himself arrived on his TIE Advanced x1 starfighter. The Sith Lord then attacked Bridger and quickly bested him in combat; destroying Ezra's lightsaber in the process.

Before Vader could finish off Ezra, Ahsoka arrived and confronted the man who had once been her Jedi mentor. Following a hostile reunion, Tano vowed to avenge Anakin Skywalker by killing the man who had killed him. While Ahsoka and Vader dueled, Kanan and Chopper arrived on the Phantom. Working together, Ezra and Kanan managed to remove the Sith holocron from the temple's obelisk; causing the battlestation to abort its firing mechanism. Their actions instead triggered an explosive implosion that destroyed the temple.

As the temple closed in on itself, Ezra and Kanan attempted to make their way back to the Phantom. However, they were held back by Vader who used the Force to pull them back. However, Ahsoka intervened and gave the two Jedi enough time to flee with Chopper on the Phantom. During the fight, Tano managed to damage Vader's helmet; exposing her master's scarred face. Unable to leave the man who had once been Anakin, Ahsoka chose to stay behind with Vader. Meanwhile, the Jedi and Chopper escaped into space with Chopper. The Sith temple imploded behind them and the Jedi believed that Ahsoka had perished during the temple's destruction.

Aftermath
The two distraught Jedi and Chopper returned to Chopper Base where they informed the other Lothal rebels and Rex about the loss of Ahsoka. Kanan was compelled to cope with his new blinded state. Meanwhile, Ezra's encounter with Maul on Malachor triggered the young Jedi's interest in the dark side of the Force. While in his room, Bridger took the opportunity to open the Sith holocron; a feat that could be accomplished by someone who had tapped into the dark side. Unknown to the Lothal rebels and Rex, Darth Vader and Ahsoka had in fact survived the destruction of the Sith temple. While a wounded and exhausted Vader exited the damaged temple, Ahsoka headed back inside the temple.

Behind the scenes
The Mission to Malachor first appeared in "Twilight of the Apprentice", a one-hour season finale that combined the 19th and 20th episodes of the second season of the Disney XD television series Star Wars Rebels. This mission marked the debut of two new characters: the Eighth Brother (who was voiced by Robbie Daymond) and Presence (who was voiced by Nika Futterman; who also served as Asajj Ventress' voice actor in The Clone Wars TV series). In addition, guest actors Sam Witwer and Matt Lanter reprised their roles as Darth Maul and Anakin Skywalker respectively.