"The Avengers" might not be assembling in theaters until May 4, 2012, but fans who attended Disney's D23 convention in Anaheim, California, over the weekend were lucky enough to catch the cast joining forces in person. MTV News was on the scene too, so stay tuned for our interviews with the stars. In the meantime, here's a little recap of the weekend's highlights:

Robert Downey Jr., Chris Hemsworth, Scarlett Johansson, Jeremy Renner, Tom Hiddleston and Cobie Smulders all showed up to unveil two new clips from the upcoming superhero flick. It was the first time the group has come together publicly since 2010's San Diego Comic-Con, and the first time "How I Met Your Mother" star Smulders has been part of the promotion for the movie.

Both of the clips shown focused on the showdown between the Avengers and "Thor" bad boy Loki, played by Tom Hiddleston, AceShowBiz reports. The first showed Loki trapped in a high-tech chamber in S.H.I.E.L.D.'s Helicarrier, chatting with Samuel L. Jackson's Nick Fury. It is revealed that the chamber was actually created to hold the Hulk, but will hold Loki because he threatens Earth with war and "a force [he] can't control."

The second scene featured Downey's Tony Stark chatting with Loki in a private bar. "Let's do a head count," Loki says. "Two world class assassins" — the camera cuts to shots of Hawkeye and Black Widow — "a demigod" — cut to Thor — "a living legend who actually lives up to the legend" — a glimpse of Captain America. Stark responds by saying, "And you, big fella, you have managed to piss off every single one of them."

"I have an army," Loki says. Stark strikes back, "We have a Hulk."

When MTV caught up with Downey and Hemsworth after the panel, the two were coy about any scenes other than the ones that have been revealed. Downey joked that his favorite scene in the movie was the one "in which we don't reveal anything about the plot," but Hemsworth admitted that his favorite was already revealed.

"One of our first days was the whole assembly," he said, referring to the scene that was revealed at the end of "Captain America: The First Avenger." "That was pretty crazy. Not only meeting Robert Downey and Scarlett and whatever, but it was meeting Iron Man and Black Widow and the Hulk. It's exciting."

Marvel wasn't the only Disney division doing some heavy lifting at D23, though. Pixar showed up with a slew of announcements, including some news about unannounced upcoming films, ScreenRant recapped.

First on the docket is "Brave," the Scotland-based animated adventure that hits in 2012. In addition to showing some new clips of the movie, Pixar also released a fleshed out plot synopsis that gives "Brave" more context. "Monsters University" received a summer 2013 release date slot, and Pixar also added two yet-untitled animated flicks to its upcoming releases. The first, directed by "Up" helmer Bob Peterson, speculates on what would happen if dinosaurs never became extinct and should hit theaters in fall 2013. The second, directed by "Monsters, Inc." 's Pete Doctor, explores inside the human mind and should be released at some point in 2014.

Also on the animation front, Shock Till You Drop reported on the "Frankenweenie" sizzle reel that was presented at the panel, which included footage from the flick, behind-the-scenes moments and interviews with the cast members. The title card for the movie was also unveiled, as well as the news that Danny Elfman will be composing the flick's score. "Frankenweenie" hits theaters October 5, 2012.

Jason Segel showed up with his "The Muppets" co-stars Kermit the Frog and Miss Piggy to present two new clips from the movie, Entertainment Weekly reported. Clip number one featured an inside look at Kermit's house and showed that he's stuck in his '80s heyday, while clip number two showed off Muppets Rolf, Kermit, Fozzie Bear and Dr. Teeth trying to get the old Muppet Theater back in working order.

Not to be outdone, the cast and crew of "John Carter of Mars" presented four new clips from their upcoming sci-fi flick. Taylor Kitsch, Willem Dafoe and Lynn Collins stood with director Andrew Stanton to show off the footage, EW recounted. The unfinished clips featured scenes where the titular Carter first lands on Mars, gets captured by Thark leader Tars Tarkas, has to battle his way out of a gladiatorial arena and tries to convince his lady love not to go through with her arranged marriage. Vulture said the clips had "a distinctly Pixar sense of humor," which can be attributed to Stanton's history with the animation company.

The last big presentation of D23 was for "Oz, the Great and Powerful," and though there was no finished footage, the panel did get to see James Franco's wizard and Michelle Williams' Glinda in costume. AceShowBiz said that a behind-the-scenes sizzle reel, narrated by director Sam Raimi, displayed concept art for the Emerald City, munchkins and the yellow brick road. The movie is currently in production in Detroit and is set to hit theaters on March 8, 2013.

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