With season seven done and dusted, it is safe to say that overall, Star Wars content out there. Like the movies, it will be rewatched by new fans for generations to come, at any age, and as older and more seasoned fans who want a deeper dive.
The series has added so much to the canon, and expanded the characters and stories so much, and so beautifully. Some of the arcs and episodes in the show are immensely important, even changing the franchise.
The Clone Wars Movie
Of course, not all the crucial Clone Wars stories came from the series, nor are all of the important stories of high quality, like The Clone Wars movie.
It introduced fans to Captain Rex, Ahsoka Tano, and all of those character dynamics with Anakin. Giving Anakin a Padawan impacts his entire story massively, especially with later events of the show. Ahsoka and Rex being brought into the franchise speaks for itself.
"Heroes On Both Sides"
"Heroes On Both Sides" is an episode in the third season of the show that does not immediately jump out as one of the most excellent episodes of the show. That is because it is not; however, it is just as vital as other episodes.
It sees Pé and Ahsoka visit the Separatist Congress and gives Ahsoka her first look at the real people of the Separatists. We never really see "good" Separatists, just villains, and this episode shows the other side of the war and the other group of people getting puppeteered.
The Mortis Arc
One of the wild things about the Mortis arc is that we do not fully know the extent of its importance yet, with the Morai seeming to be pretty heavily linked to Morai.
Nevertheless, there is no story that delves into Anakin's status as the chosen one quite like this. It adds wrinkles to the Force and the Galaxy that appears in Rebels in the episode "World Between Worlds," and it will likely pop up again soon.
The Umbara Arc
Before the Siege Of Mandalore came along, there were a couple of arcs long established as the show's very best, one of which is the Umbara arc. It deserves every bit of praise it has received.
The arc truly brought Rex's character forward in the idea of individuality, as well as various other clones, something the show spent a lot of time doing. The idea that following orders is not always the best course of action led to the climax of this arc with Pong Krell, which was nothing short of epic.
The Siege Of Mandalore
Speaking of the Siege of Mandalore, there is no doubting the fact it is now the best, or at the very least one of the top, top arcs in The Clone Wars. It was a worthy conclusion to such a wonderful show.
It leaves a lot of questions going forward, such as Vader and what he does with Ahsoka's saber, Maul, Ahsoka, and Rex's next moves, and Wolffe and Gregor. It adds so much more weight to Revenge Of The Sith and the fall of Anakin and the clones. It completes Ahsoka's journey in the show, and sets her off on a new chapter, without the Jedi, and without Anakin.
Yoda's Journey
Yoda's journey at the end of season six of the series is a wild ride, and a fascinating one that is very different from what fans of the show are used to. It has more of a Mortis feel if anything.
This story changed Star Wars in an obvious way by introducing Yoda to the idea of living in the Force after death, something he does himself and teaches to Obi-Wan. It introduces Darth Bane to on-screen audiences and canon, gives glimpses to the future that Yoda cannot stop, and is an overall fantastic story arc.
The Mandalore Plot/Mandalore Takeover
These two arcs, a couple of seasons apart, follow the events of Mandalore, Death Watch, and later, Maul, and are two of the very best and most important arcs in all of Star Wars.
The first in-season two introduces us to Satine and Death Watch, as well as show us Obi-Wan in a new light with a romance with Satine. The second arc takes place in season five and sees Maul take over Death Watch and Mandalore, as well as slaughter Satine in front of Obi-Wan. It also has an incredible battle between Maul and Savage against Palpatine. These two arcs show the story of Mandalore before the eventual siege and give more history to the planet and people, as well as more meat on the Obi-Wan bone.
The Nightsister Trilogy & Maul's Return
Once again, we are combining two arcs, this being because both lead to one thing; Maul's return. The nightsister trilogy is fantastic, seeing Dooku try to kill Asajj only for Asajj to survive and repay the favor with the help of the Nightsisters and the newly introduced Savage.
That arc ends with the reveal that Maul is alive, with Talzin sending Savage to find him. This leads to Maul's return arc in which we are introduced to a spider legged Maul who meets Obi-Wan once again in a chilling manner. In the end, Obi-Wan survives the arc, with Savage killing Adi Galia before getting bested by Obi-Wan and the two brothers escaping, plotting their next moves which came to be in the previously mentioned arc. Quite simply, Maul's return changed the franchise in a big way.
The Clone Conspiracy Arc
The season six arc which saw Tup's chip malfunction, and Fives uncover the secret of Palpatine's plot was a devastating one, and truly showed fans how close the Jedi came to knowing Palpatine's plan.
The real effects of this arc came to be in the Siege of Mandalore, as it is revealed in Rex's report of the incident that there was something going on, and that he did not believe it was nothing. This information was a factor in what helped Rex warn Ahsoka, therefore getting Rex's chip removed.
Ahsoka Leaves The Council
It is truly hard to say what would have happened if Ahsoka Tano never left the Jedi Order. Would she have been able to prevent or delay Anakin's turn? Would Rex have ed Vader in his march? There are lots of possibilities.
It was both unexpected and devastating when Ahsoka was both accused of a terrorist attack and then left the Jedi Order for good. It was one of the factors The Clone Wars presented fans concerning Anakin's fall, and it ultimately allowed her to be on Mandalore and survive Order 66, leading to everything she was to do in the future.