HARRISON FORD, GEORGE CLOONEY, SARAH JESSICA PARKER, KATHERINE HEIGL, TOM CRUISE and KATIE HOLMES are all gearing up for one of the biggest years for movies yet -- and ET has your sneak peek at the must-see flicks of 2008!

Harrison may be the one to beat as he tries on his well-worn whip and fedora in 'Indiana Jones and the Kingdom of the Crystal Skull' (May 22), with 'Transformers' star SHIA LaBEOUF as his new sidekick. KAREN ALLEN is back on board as Marion Ravenwood and CATE BLANCHETT also co-stars, with STEVEN SPIELBERG and GEORGE LUCAS back behind the camera together to pull the strings. Also dusting off an iconic '80s film character is SYLVESTER STALLONE, whose 'Rambo' comes out of retirement to save missionaries in Burma (Jan. 25). Narnia is in serious trouble and in need of a savior in the epic sequel 'The Chronicles of Narnia: Prince Caspian' (May 16). And STEVE CARELL inherits the infamous shoe phone as Maxwell Smart, opposite ANNE HATHAWAY as Agent 99, in a modern update of the '60s comedy series "Get Smart."

Several superheroes take center stage this year when CHRISTIAN BALE's Batman battles HEATH LEDGER's Joker in 'The Dark Knight' (July 18); ROBERT DOWNEY JR. debuts as the metallic flying comic book hero 'Iron Man' (May 2); and WILL SMITH is 'Hancock' (July 2), a hero who's in serious need of an image overhaul. And HAYDEN CHRISTENSEN's cool teleportation abilities get him into a heap of trouble in 'Jumper' (Feb. 14).