George Lucas referred to the medium of television as an "experimental cauldron," and another of these experiments is concluding.

"Star Wars Rebels" Season Four will be the last for the Disney XD animated series. Executive Producer Dave Filoni revealed the show's fate Saturday during its Star Wars Celebration panel in Orlando, Florida.

"I know what it's like when you don't end a series," he said, referring to the unceremonious end to "The Clone Wars." He added, "It wasn't fun, so believe me -- this represents by no means an end to what we're doing in animation."

Turning to his fellow cast members on stage -- Freddie Prinze Jr., Taylor Gray, Tiya Sircar, Vanessa Marshall, and Steven Blum -- Filoni reflected, "We've done something really special here. I'm really proud of these characters... I think it's one of the best things the animation division has ever done."

The Season Three finale, which aired in March, saw an attack from the villainous Thrawn on what he assumed were the last remaining ships of the Rebel fleet.

Coming into Season Four, Filoni teased, "It's gonna be different, a little dark, a little fun."

The final season of "Star Wars Rebels" will premiere sometime in the Fall of 2017. Watch the first trailer for Season Four now: