"I was shocked," said Clark Gregg, who reprises the role of Phil Coulson for the fourth time in "The Avengers", of first reading Joss Whedon's script. "As someone who's been in these movies, who loves these movies, who loved the comics, who knows these heroes, and who loves good writing, I didn't know how anyone was gonna do it."

Critics are shocked too - against all odds, the hugely-anticipated superhero film that could've gone wrong in a million different ways now stands at a whopping 94% "fresh" on Rotten Tomatoes, with Drew McWeeny (who chatted with Gregg and co-star Cobie Smulders during the film's recent press junket) giving the film an "A" in his own review. So what's the secret to Whedon's success?

"It's a magic trick," said Gregg. "The fact that it's so human, and so funny, and then so damn exciting...I don't know how he did it, so I'm kind of a little freaked out by him right now."

You can watch Drew's full interview with Gregg and Smulders (who appears in the franchise for the first time as S.H.I.E.L.D. agent Maria Hill) above!

"The Avengers" hits theaters on May 4.