The most recent episode of Star Wars: Rebels kicked off the end game for the second season of the show. This season has seen Kanan, the last Padawan attempt to teach Ezra the ways of the Jedi while Ezra has begun to be tempted by the Dark Side of the Force as he grows in power. The rest of the Rebels team is helping the greater Rebellion seek a new secret base with the help of former Jedi Knight Ahsoka Tano, who trained under Anakin Skywalker during The Clone Wars.The episode “Shroud of Darkness” included revelations for all three characters, Ezra’s came in the form of sage advice from Master Yoda. While Kanan and Ashoka’s visions warned of Jedi turning dark, Yoda told Ezra that the team must find Malachor. With that tantalizing name drop, Rebels introduced the possibility of bringing events from Knights of the Old Republic back into canon and connecting them to The Force Awakens.The first Knights of the Old Republic game released in 2003 and was made by BioWare who developed the story of the Republic and the Sith that took place four thousand years before the rise of the Galactic Empire. As the player, you discovered the world of the Old Republic as it was under attack by Darth Malek and his Sith fleet. The player grows in his/her Force abilities, eventually training to become a Jedi. About halfway through the game it’s revealed that the player is actually Darth Revan, Malek’s former master who had his/her mind wiped by the Jedi Council.Darth RevanThe character of Revan would end up being a key figure in the Expanded Universe in this very early era (in the Star Wars Universe). Revan was a Jedi who fought against the Mandalorians in the Mandalorian War that precedes Knights of the Old Republic’s story. He and his companion Malek were frustrated that the Jedi Order wasn’t doing more to aid the Galactic Republic in the war against the Mandalorians (the race Boba Fett and Sabine get their armor from).Reven and Malek broke off from the order and took some Jedi with them (called the Revanchist) to fight the Mandalorians. They were successful in killing the Mandalore Ultimate and scattering the Mandalorian tribes across the galaxy, but in ending the war, Revan and Malek severed their connections with the Jedi and traveled to the Unknown Regions where they eventually turned into Sith Lords.The final battle of the Mandalorian Wars is portrayed in Knights of the Old Republic II, it’s a large space battle above a planet called Malachor V. Revan battles the Mandalore Ultimate and your game character (called The Exile) activates a terrible superweapon over the planet that ends the war by destroying everything. Depending on how deep into the Expanded Universe canon you want to go, the mass death of the Battle of Malachor left a permanent mark on the Force.Star Wars: The Clone Wars, the animated series that takes place between Attack of the Clones and Revenge of the Sith shares a lot of the creative team with Star Wars: Rebels even though the first animated series was made under the direction of just Lucasfilm and Rebels has to operate in the greater Disney-owned Star Wars Universe. The events of The Clone Wars animated series managed to avoid being un-canonized with the rest of the Expanded Universe under Disney’s acquisition which barely – just barely – keeps Malachor in the canon even though Knights of the Old Republic isn’t.The Clone Wars season five, episode twelve is called “Missing In Action.” The episode follows Colonel Gascon and his droid squad (yeah, it’s an R2-D2 episode) as they deal with a clone trooper with amnesia, which isn’t important. What is important is a single line uttered by Colonel Gascon: “But there’s no way in Malachor that I’m going to lead this pitiful squad on an assault of that landing zone.” This introduced Malachor into the canon officially, even if it’s just replacing the curse word “hell” in this single usage.Malachor being a hellish planet isn’t enough to confirm that The Clone Wars expression has roots in the Knights of the Old Republic story, but it did establish the planet existing in the canonical universe. The hints that Knights of the Old Republic, or at least the Battle of Malachor V, would be reintroduced have more to do with The Force Awakens Visual Dictionary and the upcoming episodes of Star Wars: Rebels.This December, alongside the movie, Star Wars: The Force Awakens Visual Dictionary was released and included important details from the Star Wars canon that weren’t spoken aloud in the film. One of those factoids concerned Kylo Ren’s unique crossguard lightsaber. The Visual Dictionary says the lightsaber design is “thousands of years old” and that it dates back to the “Scourge of Malachor.”As of now, no other references to an event called “The Scourge of Malachor” exist in the Star Wars Expanded Universe new or old. What it could be is renaming the Battle of Malachor V in a way that doesn’t have to also include the nitty-gritty of The Exile and a Mass Shadow Generator. The description of the end of the Battle of Malachor from Wookiepedia certainly sounds like a scourge:“In an instant, Malachor’s gravity crushed every combatant in and around its atmosphere—Mandalorian, Republic, and Jedi alike. Malachor’s surface was transformed into a barren, shattered and lifeless wasteland—all of Revan’s enemies were eliminated in a single stroke. The planet was left scarred from the battle as the surface had been obliterated.”In the Knights of the Old Republic canon, there was an old Sith Academy on Malachor that was founded by the True Sith (it’s a long story, but sometimes the Sith act more like the Empire and far from obey “the rule of two” that’s in play when the movies take place). In Knights of the Old Republic II, The Exile visits Malachor to discover what had turned Revan to the Dark Side and finds that the Sith Academy temple still survives. The villains of the second game, the Sith Triumvirate, were trained there.All of this is being set up to come to a head in three weeks when Star Wars: Rebels lets Ezra find Malachor. What he finds there will, at the very least, be new and exciting additions to the canon (previews all but confirm he will find Darth Maul, last seen in The Clone Wars animated series). The extended preview for the second half of Rebels season 2 included some shots of what looks like a Sith Temple.Dave Filoni, the showrunner of Rebels says that this temple is underground and that “It is an ancient place. And it is a dangerous place and one that will challenge our characters.” You can see things encased in ash, like those doomed by the volcanoes of Pompeii.If there’s an important and ancient Sith Temple on Malachor, that’s a step towards the Knights of the Old Republic canon. Although it’s unclear if the Scourge of Malachor is the superweapon ending of the Battle of Malachor V. Would a superweapon for a space battle have the power to leave ash impressions of people and things in a subterranean location?The one piece of amazing interlocking evidence that brings the “Legend” of Darth Revan in line with the new Disney canon being made by The Force Awakens is that Rebels also showed Ezra finding a lightsaber with a crossguard and the background makes it look like he is on Malachor.“I wanted to put a nod to this new history we’re seeing in The Force Awakens. It’s important to have these links between stories in major ways and subtle ways,” Filoni told Entertainment Weekly. “Here you find a sword we’ve encountered before, and it gives a little more context to something that turns up later.”The key Rebels episodes will likely be the season finale two-parter called “Twilight of the Apprentice” set to air on March 30th. The synopsis for part one reads: “After gaining information about the Sith, Kanan, Ezra and Ahsoka battle the Inquisitors with the help of a new ally, but are overmatched when Vader arrives.”Anything we learn about the Sith from the Sith Temple and Darth Maul will be helpful to establishing the backstory of Malachor, possibly hinting at the True Sith or the Sith Empire from thousands of years before. If the green cross-guard lightsaber really is found on Malachor, that would connect the Scourge of Malachor to the Sith Temple planet and date both “thousands of years old.”The Battle of Malachor V took place 4,000 years before the Battle of Yavin (end of A New Hope), and if the Scourge of Malachor is linked up to a Sith Temple and a war against the Mandalorians from long ago, it’s likely that we’re talking about the same Knights of the Old Republic canon as a mythical backstory to Star Wars: Rebels.When Disney bought Star Wars, all the old Expanded Universe content was re-labeled “Legends.” The Star Wars Universe has it’s own internal lore as well, and it’s looking like the two might start crossing over, admitting certain “Legends” were based on canonical fact. There may not have been a Mass Shadow Generator, but maybe there was a good-meaning Jedi who lost his way trying to win a war and destroyed Malachor. Is it too much to hope that person is name dropped as Revan?We’ll know on March 30th for sure.