Fans have been eating up all the brand new information coming out of Disney and Lucasfilm's Star Wars Celebration in London this weekend but they just broke the internet with some huge news - a famous Legacy character is coming to Star Wars Rebels.

Star Wars Rebels is gearing up for its third season and they are not holding back. Set 14 years after Revenge of the Sith and five years before the first Star Wars, the animated series has forged its own path while also continuing story lines from the Star Wars: The Clone Wars animated series.

"Governor Price, these Rebels have proven particularly stubborn. How do you intend to solve this problem?" asks Tarkin in the Season 3 trailer which debuted at Celebration. "I need someone who sees a bigger picture," she replies...

Grand Admiral Thrawn is back! Arguable the most famous Legacy (previously called "Expanded Universe") character, Thrawn was introduced in a novel trilogy in the 90s. He'll be voiced on Star Wars Rebels by Lars Mikkelsen, brother to Rogue One's Mads Mikkelsen.

Check out his debut in the Star Wars Rebels Season 3 trailer, which premiered at Star Wars Celebration.

"Where to begin," said executive producer Dave Filoni, "We've got your back at Lucasfilm. We're all good. Look, you couldn't have grown up a Star Wars fan without encountering Thrawn. And 'Heir to the Empire' was a significant part of most of our lives growing up. There was a dark time where there weren't new movies and we were looking for new material and all of a sudden there's a trilogy of books called 'Heir to the Empire'...blew our minds. Like, how could there be more?"

"It was always on a lot of our minds," he continued. "We tried to strategize on when it would be best to bring him in was important to do it right to kind of build the series in the right way. And a bit part of that too is finding the right actor to play that part. And I have to say, this was one of the most challenging characters that we ever had to cast in Grand Admiral Thrawn. We're really lucky we got Lars Mikkelsen to come in and play him. He's fantastic."

But they didn't stop there. Thrawn creator, Timothy Zahn, is writing another novel simply named Thrawn.

I won't pretend to be an expert on the EU but I know this is a HUGE deal. It also inevitably brings to mind other Legacy characters fans are hoping to see brought into current continuity such as...

I'll just take that to mean she's getting her own solo film...

Jill Pantozzi is a pop culture writer and host who reports on all things nerdy and beyond! Her blog was recently relaunched with Patreon support and she’s formerly Editor in Chief of The Mary Sue. She’s written for MTV, Tor, Playboy, Publishers Weekly, IGN & more. You can keep up with Jill, and her cats, on Twitter at @JillPantozzi.