A starring role in the WWII melodrama “Pearl Harbor” put Josh Hartnett at the forefront of the emerging twenty-something actors of the time, though it was not the most indicative work of an actor who preferred the murky waters of dark indie drama. His breakout role in the horror hit “Halloween H20: 20 Years Later” (1998) jettisoned him to teen heartthrob status, but Hartnett was able to break from the post-adolescent pigeonholing that might have resulted from “The Virgin Suicides” (1999) and the multiple appearances onmagazine’s “Hottest” lists. He went on to build a solid reputation with his strong, understated Midwestern presence in films like “Lucky Number Slevin” (2006) and “The Black Dahlia” (2006).