Gyllenhaal flexes his muscles: Aidin Vaziri | Among the full-grown men dressed as “Transformers” characters, greasy teens gawking at “Twilight” action figures and auxiliary “Dukes of Hazzard” cast members hoping to sell $20 autographs at Wondercon, the last person you would expect to find in the fray is a serious Hollywood actor like Jake Gyllenhaal. Yet here he is, the star of solemn dramas such as “Donnie Darko” and “Brokeback Mountain,” in one of the back conference rooms of the Moscone Center looking oddly inconspicuous in a black sweatshirt and blue jeans and feeling a little frustrated that his handlers won’t let him out to mingle with the thousands of costumed revelers on the floor. “I’ve always heard about these events, and I’ve always wondered what they were like,” the 29-year-old Los Angeles native says, sipping a cup of green tea. “This feels like home. This is what it was like every Sunday at the Gyllenhaal house.” Read more.