Sept. 24, 2012 | 7:51 p.m.
How could Loki, a villain who was defeated by a single superhero in “Thor,” become a believably formidable foe for a team of six superheroes backed by S.H.I.E.L.D.? The question plagued Loki actor Tom Hiddleston, 31, when he was preparing for “The Avengers,” out on Blu-ray and DVD Tuesday. “That was what I was so terrified I would fail to do,” Hiddleston said. “It’s a big old movie.” Big it certainly is. “The Avengers,” which cost $220 million to make, was a popular and critical hit, earning more than $1.5 billion worldwide and making director Joss Whedon a household name. The film unites a team of A-list muscle men, many of them already stars of their own Marvel movies, including Robert Downey Jr. (“Iron Man” and “Iron Man 2″), Chris Evans (“Captain America”), Chris Hemsworth (“Thor”), Black Widow actress Scarlett […]