Marvel gave London fans a first look at 30 minutes of Avengers: Infinity War footage last Sunday, with directors Anthony and Joe Russo, as well as Marvel stars Tom Hiddleston, Benedict Cumberbatch and Tom Holland, on hand to answer questions after the screening. What many fans did not know is that the event was also the first time the three stars had seen a part of the film."It was pretty hyped, it was wonderful and it was the same for us, because we hadn't seen the footage until last night," Cumberbatch said during a Good Morning America interview with Holland and Hiddleston in tow. "We came out as fired up as the fans."RELATED: Infinity War’s Latest Promo Raises A Lot of Questions"None of us have seen the film and we'll be seeing it at the same time as you guys see it on April 27, because there's so much about the film that's being kept under wraps [and] being kept secret," Hiddleston said.While none of the three cast members have seen the film in its entirety, Cumberbatch is the only one with the privilege of having read the entire script. That was out of necessity, as his character, Doctor Strange, is key to tying the disparate parts of the MCU into a cohesive whole.RELATED: Thanos Crushes the Avengers Logo in Awesome Infinity War Promo"I had to understand what the context was," Cumberbatch said. "Strange has this wonderful role in it, and I'm trying to hold the multiverse together, so I kind of needed to know what goes on in between those brackets."It also seems like some stars are being kept in the dark for a reason. Holland revealed he tried to get permission to read the script but has been denied, probably because of his well-known inability to keep secrets:

Directed by Joe and Anthony Russo, Marvel Studios’ Avengers: Infinity War stars Robert Downey Jr., Chris Evans, Chris Hemsworth, Mark Ruffalo, Jeremy Renner, Scarlett Johansson, Paul Bettany, Anthony Mackie, Paul Rudd, Elizabeth Olsen, Tom Holland, Benedict Cumberbatch, Chadwick Boseman, Chris Pratt, Zoe Saldana, Dave Bautista, Bradley Cooper, Vin Diesel, Tom Hiddleston and Josh Brolin, among others. Avengers: Infinity War opens April 27, 2018.