Robert Downey Jr. and Scarlett Johansson were front and center today as they joined their costars from The Avengers for a photocall in Moscow. Chris Hemsworth, Jeremy Renner, Mark Ruffalo, and Tom Hiddleston were also on hand to pose for pictures at the European press stop. The cast of the Marvel and Disney movie will spend the next few weeks on the road promoting their project, which hits theaters in the US on May 4. We were live at their big Hollywood premiere earlier this month, where we chatted up the stars of the film and learned a little more about what it was like behind the scenes on the set. During our interview with Scarlett Johansson, she joked that she had to "meditate" to deal with the discomfort and heat of her rubber costume. Meanwhile, new dad Robert Downey Jr. basked in the fan attention at the debut. He and his wife, Susan Downey, stepped out for the red carpet event after welcoming their son Exton in early February.