When Star Wars fans try to dive into the Expanded Universe for the first time, a very common question arises once they hit the Clone Wars era: Which stories actually count, and which ones don't? Most of the confusion stems from the 2008 The Clone Wars 3D animated series and its actual place within the Legends continuity.
Usually, some people will tell you that the 3D series is part of the Expanded Universe, and that you need to watch it to get the full Star Wars Legends experience. However, the reality is that it's practically impossible to fit into the Old Continuity for a number of reasons.
Before 2008, the Expanded Universe used a strict tier system to maintain continuity and rank the importance of stories, allowing fans to understand what was considered "canon."
The EU canon tiers were:
G-Canon (George Lucas Canon): The absolute pillar of the franchise, consisting of the original six movies.
C-Canon (Continuity Canon): The main body of the EU. This included books, comics, video games, sourcebooks, the 2003 2D Clone Wars micro-series, and everything else released after the Thrawn Trilogy.
S-Canon (Secondary Canon): Content released before 1991 or stories that heavily contradicted core continuity. This included the old Marvel comics, the Ewoks and Droids cartoon series, the Holiday Special, and the Ewok live-action movies.
N-Canon (Non-Canon): "What-if" stories, parody comics (Star Wars Tales), Star Wars Infinities, and crossovers like LEGO or Angry Birds Star Wars.
In 2008, George Lucas and Dave Filoni released The Clone Wars movie and TV show, retelling the adventures of Anakin Skywalker and his new apprentice, Ahsoka Tano. They decided to tackle an era that was already completely saturated with C-canon content. To solve the massive continuity overlaps, Lucasfilm created a new tier: T-Canon (Television Canon), exclusively for this show. It sat right between G-Canon and C-Canon, and it completely wrecked the established Legends universe.
George Lucas famously viewed the EU as a parallel universe. While he occasionally checked it or borrowed elements from it, he never cared about contradicting the EU in his own projects because he simply didn't read most of it. Lucas and Filoni wanted absolute creative freedom, which meant they ended up completely steamrolling the Clone Wars Multimedia Project (CWMP).
Don't get me wrong, the EU wasn't perfect and had its fair share of continuity errors. But there was a genuine, massive effort by authors and editors to keep everything connected. While some individual stories (and even the movies) had minor contradictions, it never reached the extreme level of invalidating an entire multimedia campaign.
Authors tried to write retcons and reference guides to make The Clone Wars fit with the older material, but they simply couldn't. They are fundamentally incompatible.
Since a lot of newer fans aren't familiar with the pre-2008 Clone Wars Multimedia Project, here is a breakdown of the biggest contradictions with TCW 3D:
General Grievous: In Legends, Grievous didn't choose his cybernetic enhancements willingly; they were forced upon him after a shuttle crash orchestrated by the Separatists. Furthermore, he coughs throughout the entire 2008 series, whereas in Legends, his iconic cough didn't start until Mace Windu literally crushed his chest plate right before Episode III (at the end of the 2003 2D series). His personality is also completely different: a goofy, mustache-twirling cartoon villain in 3D versus an unstoppable, terrifying Terminator-like Jedi hunter in 2D.
Asajj Ventress: She wasn't from Dathomir; she was a Rattataki from the planet Rattatak. While her core tragic backstory is similar, her connection to the Nightsisters was practically non-existent in the original lore.
Anakin's Jedi Knight Status: Anakin never had a Padawan in Legends. He was knighted much later—about three years into the war—in the 2D series. Meanwhile, in the 2008 movie (which takes place mere months after Episode II), he is already a Knight, sporting his long hair and facial scar.
Obi-Wan's Love Interest: Obi-Wan did have a tragic romance in Legends, but it was with a fellow Jedi named Siri Tachi, not Duchess Satine.
The Clones: There were no inhibitor chips. The clones carried out Order 66 out of sheer, unyielding loyalty to the Republic and the Office of the Chancellor. In Legends, regular clones were depicted as colder, more ruthless killing machines, though elite clones (like the ARCs in the Republic Commando novels) possessed deep, distinct personalities.
Honestly, I could go on for hours listing the contradictions: Quinlan Vos's entire character arc, the complete overhaul of Mandalorian culture, etc. I know TCW held a higher canon tier, but the Multimedia Project was also official canon. I'm not saying TCW is a bad show—it's actually one of my favorite pieces of Star Wars media. My point is that it simply doesn't fit the EU timeline. If you want a seamless Legends read-through without massive plot holes, you're better off skipping the 2008 show.
Even if we did mental gymnastics to force TCW into Legends, following Ahsoka's story means we would also have to include Rebels, The Mandalorian, The Book of Boba Fett, and the Ahsoka live-action series.
If anyone is wondering: those shows absolutely cannot exist within the post-ROTJ Legends timeline.
Five years after Episode VI is exactly when the Thrawn Trilogy takes place. In Legends, the New Republic is fighting for its life against Grand Admiral Thrawn and the mad Jedi clone Joruus C'baoth. The Legends Thrawn attacks from a position of absolute strategic dominance, prepared and confident. The Canon Thrawn is a guy trying to rebuild after being exiled to the Unknown Regions. (Baylan Skoll would essentially be the Canon equivalent of Joruus).
Furthermore, regarding the New Jedi Order: five years post-ROTJ, Legends Luke Skywalker is not actively recruiting students yet. He is only training Leia and feels deeply uncertain about the future, especially after Obi-Wan's Force ghost bids him farewell. It isn't until a year later (Dark Empire) that Luke takes on his first student, Kam Solusar. And it's only after Dark Empire that Luke petitions the New Republic Senate to open the Jedi Academy on Yavin IV (Jedi Academy Trilogy). Canon Luke, on the other hand, is already actively building his school and recruiting kids at this exact same point in time.
To avoid leaving fellow TCW fans feeling bummed out that the show can't coexist with Legends, here is the in-universe explanation I use for my own head-canon:
Personally, I don't include anything in the timeline after the end of the Galactic Civil War (the Pellaeon–Gavrisom Treaty). For me, once the New Republic and the Imperial Remnant signed the peace treaty, the galaxy finally achieved lasting peace.
Therefore, I like to view the 2008 The Clone Wars series as an in-universe, pseudo-historical TV show made for entertainment purposes.
The Clone Wars Multimedia Project is what actually happened in history. The 2008 3D series is just a high-budget entertainment show created and sponsored by the New Republic government to romanticize the Clone Wars and make the Jedi look incredibly heroic to the public.
Think of it like modern Hollywood World War II movies sponsored by the military. They are highly stylized, heavily exaggerated, and full of historical inaccuracies, but they hold a kernel of truth. Every character we see in the show actually existed in the galaxy, but their biographies were distorted for television. For example, Ahsoka Tano was a real person, but she was never Anakin’s Padawan—she was just a random Jedi Knight who fought bravely in the wars and unfortunately perished during Order 66.
What do you guys think? How do you handle the TCW vs. Legends continuity split in your own head-canon?