Last night, a new Avengers: Age of Ultron trailer went online, and now we've grabbed over 25 of the best shots from it. There was a lot of new footage in this trailer, but the somber tone remains the same. Even though Whedon and the first movie had plenty of humor, the only joke we've seen so far is the one involving Thor's hammer. If the tone of the second film is much darker than so be it, but I hope there's at least some levity, especially since humor is one of the key aspects of the Marvel Cinematic Universe. But at the very least, judging from these screenshots, Age of Ultron will at least look cool.

Hit the jump to check out the Avengers: Age of Ultron trailer screengrabs. The film stars Robert Downey Jr., Chris Evans, Mark Ruffalo, Chris Hemsworth, Scarlett Johansson, Jeremy Renner, Elizabeth Olsen, Aaron Taylor-Johnson, James Spader, Stellan Skarsgard, Samuel L. Jackson, Cobie Smulders, Paul Bettany and Don Cheadle. Avengers: Age of Ultron opens on May 1st.

Here's the official synopsis for Here’s the official synopsis for Avengers: Age of Ultron:

Marvel Studios presents “Avengers: Age of Ultron,” the epic follow-up to the biggest Super Hero movie of all time. When Tony Stark tries to jumpstart a dormant peacekeeping program, things go awry and Earth’s Mightiest Heroes, including Iron Man, Captain America, Thor, The Incredible Hulk, Black Widow and Hawkeye, are put to the ultimate test as the fate of the planet hangs in the balance. As the villainous Ultron emerges, it is up to The Avengers to stop him from enacting his terrible plans, and soon uneasy alliances and unexpected action pave the way for an epic and unique global adventure.

Click here for more Avengers: Age of Ultron coverage or visit the links below: