Spider-Man, Batman and an army of Marvel superheroes head the summer 2012 pack, alongside reboots of the Bourne and Alien franchises, animation favorites like Ice Age and Madagascar, a new Pixar heroine, Expendables and Men in Black, a rockin’ Tom Cruise and an axe-wielding Abe Lincoln. It’s another hot movie season!The Avengers, only a team of superheroes can stop a fearsome new enemy. An epic lineup of stars reprises their roles, big or small, from previous Marvel films. The cast includes Robert Downey, Jr., Chris Evans, Mark Ruffalo, Scarlett Johansson, Jeremy Renner, Chris Hemsworth, Samuel L. Jackson, Tom Hiddleston and Stellan Skarsgård. Joss Whedon (Serenity, Buffy the Vampire Slayer), a fanboy favorite, directs the 3D film from his script. (Disney; May 4)English pensioners are swayed by advertisements about a luxurious retirement community in India in The Best Exotic Marigold Hotel. The accommodations turn out to be less than lavish, but the seven people staying there end up finding strength in one another. Judi Dench, Maggie Smith, Tom Wilkinson, Bill Nighy and Dev Patel star in the romance-comedy-drama hybrid. John Madden (Shakespeare in Love) directs. (Fox Searchlight; May 4)Johnny Depp again dons heavy makeup to play the vampire Barnabas in director…