Joss Whedon's 'Marvel's Agents of S.H.I.E.L.D.'

Marvel's Agents of S.H.I.E.L.D. Tuesday, Sept. 24, 8 p.m., ABC Co-created by geek idol Joss Whedon ("Buffy the Vampire Slayer"), this hyperactive series plucked from the Marvel comic-book canon is an epilogue to Whedon's big-screen "Avengers" adaptation, in which the U.S. government grapples with the existence of mutant superheroes and aliens.