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Whedon said in a recent interview with
MTV News.
"It's great, he's been weaving his way through every movie and I really get to play with him and have [him do] a lot of stuff. There were things that during the writing, I was like, 'I need something more here... Oh, Coulson!' and he just, he comes up every time. Clark is such a wonderful guy but also such a precise actor. The whole troupe is so amazing, I'm actually surprised."
"I have reached the top, I'm going down the other side, I've just realized my Sherpa guide is frozen to death and several of my toes are missing," he added when asked about how work is progressing on the movie so far.
"But we are on our way down."
As for how he's feeling, Whedon revealed that he's not yet got to the point where his thoughts about the movie are invading his dreams, but they are keeping him up at night!
"I don't dream, I just think about coverage while sleeping, and then I wake up four hours later. It is an enormous task. It's not daunting in the sense of any kind of responsibility except the responsibility I always have, which is 'Will the audience respond to this? Have I given as much as I can? Have I made the actors do as much as they can? Have I made them comfortable? Does it all track as a movie?' The complexity of this giant puzzle sort of wakes you up at 2 a.m. pretty much every night."
"I've encouraged people to come to set because people assume they can't. For my own self, I try to get my wife there," he admitted.
"She doesn't really like being on set because it's sort of dull, and occasionally I import a friend just to have that touchstone of someone who knows who I am. Everyone is wonderful, but they're all new, and when you're in the thick of it you need someone to go, 'You're not crazy.' "
STARRING:
Chris Evans as Steve Rogers/Captain America
Robert Downey Jr. as Tony Stark/Iron Man
Chris Hemsworth as Thor
Jeremy Renner as Clint Barton/Hawkeye
Scarlett Johansson as Natasha Ramanoff/Black Widow
Mark Ruffalo as Bruce Banner/Hulk
Samuel L. Jackson as Nick Fury
Tom Hiddleston as Loki
RELEASE DATE: May 4th, 2012. (US)