You've been hearing casting reports on it for weeks, and you've been wondering ever since the project was announced exactly how Pixar genius Andrew Stanton would handle a live-action sci-fi movie. And now, it's finally happened-- John Carter of Mars is a reality!

Well, it's started filming at least, which means it will be a real live motion picture before too long. Disney sent out a press release today announcing the start of filming, and a whole lot of names are listed as part of the cast that I, at least, hadn't heard before. Along with lead actors like Tayor Kitsch, Lynn Collins, Willem Dafoe and Mark Strong, the cast is filled out with names like Ciaran Hinds, Dominic West and Daryl Sabara, who you'll remember either from the Spy Kids franchise or this summer's dark comedy World's Greatest Dad. So remember everything we've said before about how exciting this cast is? Yeah, double that.

Below is the full press release announcing the beginning of filming in London. Given that they're doing a lot of soundstage work to start with, it may be a while before we start seeing set photos, but we'll be anxiously awaiting them all the same.

BURBANK, Calif. (January 15, 2010) – Principal photography is underway in London for Walt Disney Pictures’ “JOHN CARTER OF MARS.” Academy Award®-winning filmmaker Andrew Stanton brings this captivating hero to the big screen in a stunning adventure epic set on the wounded planet of Mars, a world inhabited by warrior tribes and exotic desert beings. Based on the first of Edgar Rice Burroughs’ “Barsoom Series,” the film chronicles the journey of Civil-War veteran John Carter, who finds himself battling a new and mysterious war amidst a host of strange Martian inhabitants.

Produced for Walt Disney Pictures by Jim Morris (“WALL•E,” “Ratatouille”) and Colin Wilson (“Avatar,” “War of the Worlds”), the live action/animation film marks Academy Award®-winning director/writer Andrew Stanton’s (“Finding Nemo,” “WALL•E”) first foray into live action. Stanton directed and co-wrote the screenplay for Disney•Pixar’s “WALL•E,” which earned the Academy Award and Golden Globe® for Best Animated Feature (2008); Stanton was nominated for an Oscar® for the screenplay. He made his directorial debut with Disney•Pixar’s “Finding Nemo,” garnering an Academy Award-nomination for Best Original Screenplay and winning the Oscar for Best Animated Feature (2003). He has worked as a screenwriter and/or executive producer on Disney•Pixar’s “Toy Story,” “A Bug’s Life” (which he also co-directed), “Toy Story 2,” “Monsters, Inc.,” “Ratatouille” and “Up.”

"I have been waiting my whole life to see the characters and worlds of 'John Carter of Mars' realized on the big screen,” says Stanton. “It is just a wonderful bonus that I have anything to do with it."

The stellar ensemble cast is led by Taylor Kitsch (NBC’S “Friday Night Lights”, “X-Men Origins: Wolverine”) in the title role, Lynn Collins (“50 First Dates,” “X-Men Origins: Wolverine”) as the warrior princess Dejah Thoris and Oscar® nominee Willem Dafoe (“Spider-Man 3,” “Shadow of a Vampire”) as Martian inhabitant Tars Tarkas. The cast also includes Thomas Haden Church (“Sideways,” Spider-Man 3), Polly Walker (upcoming “Clash of the Titans,” “Patriot Games”), Samantha Morton (“Elizabeth: The Golden Age,” “In America”), Mark Strong (“Sherlock Holmes,” “Body of Lies”), Ciaran Hinds (“Munich,” “There Will Be Blood”), British actor Dominic West (“300,” “Chicago”), James Purefoy (“Vanity Fair,” “Resident Evil”) and Bryan Cranston (“Breaking Bad”). Daryl Sabara (“Disney’s A Christmas Carol,” “Spy Kids”) takes the role of John Carter’s teenaged nephew, Edgar Rice Burroughs.

The creative team includes Oscar®-nominated production designer Nathan Crowley (“Public Enemies,” “The Dark Knight,” “Batman Begins”), costume designer Mayes Rubeo (“Avatar,” “Apocalypto”), cinematographer Daniel Mindel (“Star Trek,” “Mission Impossible III,” “Spygame”) and video effects supervisor Peter Chiang (“The Reader,” “The Bourne Ultimatum”).