(CNN)For "Star Wars Rebels," the battle is soon going to be over, as the animated Disney XD series forges ahead in its fourth and final season, during what's become an especially busy time in the "Star Wars" galaxy.
'Star Wars Rebels' blasts toward series finale
The latest two-part episode reflects how the show, set several years prior to the original movie, has gradually run out of real estate, while dipping into other parts of the franchise. It features appearances by the rebel leader Mon Mothma and the character Saw Gerrera, introduced in the prequel "Rogue One: A Star Wars Story." (Forest Whitaker, who played Gerrera, again provides the voice.)
Dave Filoni, the Lucasfilm Animation veteran who has overseen "Rebels" and before that the computer-animated "Clone Wars," said the ending had less to do with the "Star Wars" timeline -- which has grown more crowded with its emphasis on stand-alone features, like the upcoming Han Solo movie -- and more with the program's natural lifespan.
"You wanted to draw conclusions to some of the characters," Filoni said, adding that in terms of the youthful audience that serves as the show's foundation, "If you can keep them for four years, it's actually quite an accomplishment."
The most recent "Clone Wars" premiered in 2008, during a relative drought after George Lucas completed the second movie trilogy. By contrast, "Rebels" made its debut in 2014, following the Walt Disney Co.'s 2012 acquisition of Lucasfilm and an accelerated production pace intended to generate maximum bang for those bucks.
Although "Rebels" plays on a children's network, there are a fair number of adults in its weekly audience. Still, bringing the program to a satisfying conclusion -- without dispatching key characters fighting against the Empire in a manner that puts kids on a therapist's couch -- does represent a challenge.
"It is quite a puzzle," Filoni said. "Technically, our show wouldn't seem to be coming to a conclusion when things are that great in the galaxy."
Without giving anything away, he added, "The ending works as it's meant to. One of George's main things about 'Star Wars' is it is a story about hope. ... I tried to stick to those themes."
"Rebels" will actually take a break in its 16-episode season in late November, as Lucasfilm focuses attention on the live-action sequel "The Last Jedi." The series will return with its final flurry of episodes early next year, when people will likely be hungry for more "Star Wars"-related content.
Certainly, this is a boom time for fans, but "Rebels'" finish also raises questions about where "Star Wars" animation goes next. The company has already sought to demonstrate its versatility by branching into shorts and online content, and Filoni sees plenty of room to operate, with a cinematic universe big enough to accommodate all kinds of storytelling.
"It's almost limitless," he said. "For me, it's kind of self-serving, because I want to keep working. Hopefully, we can apply this in different areas and different stories going forward for years to come."
"Star Wars Rebels" airs Mondays multiple times on Disney XD.