All of the Avengers reassembled for the first time Tuesday to shoot scenes for the upcoming movie. Downey Jr. and Ruffalo will reprise their roles as Iron Man and the Hulk, respectively, and Chris Hemsworth (Thor), Chris Evans (Captain America), Scarlett Johansson (Black Widow) and Jeremy Renner (Hawkeye) will also return.
Ruffalo posted a picture of himself with Downey Jr. on his Twitter, and captioned the photo "Bros."
The actor also posted a shot of Johansson in a black robe that was emblazoned with her Avenger's moniker, "Black Widow." "Almost got her!!!" he wrote.
Downey Jr. took to his own Twitter to post his first tweet from the Avengers set. The actor said, "You asked for it!" and posted a photo of himself with executive producer Jeremy Latcham.
The star also shared a photo of the Avengers stars' chairs. Evans, Renner, Hemsworth, Johansson and Ruffalo were all pictured, and Downey Jr.'s chair was inexplicably shorter than everyone else's.
Marvel seems to have scolded Ruffalo for his enthusiastic posts -- the actor later tweeted an apology to the studio and promised to "do better."
I'm sorry @marvel. I will be better. I'm like your black sheep Avenger.— Mark Ruffalo (@MarkRuffalo) April 23, 2014
Avengers: Age of Ultron debuts in theaters on May 1, 2015.