Bud and Doyle are two losers who are doing nothing with their lives. Both of their girlfriends are actively involved in saving the environment, but the two friends couldn't care less about saving the Earth. One day, when a group of scientists begin a mission to live inside a "Bio-Dome" for a year without outside contact, Bud and Doyle mistakenly become part of the project themselves.
After losing their academic posts at a prestigious university, a team of parapsychologists goes into business as proton-pack-toting "ghostbusters" who exterminate ghouls, hobgoblins and supernatural pests of all stripes. An ad campaign pays off when a knockout cellist hires the squad to purge her swanky digs of demons that appear to be living in her refrigerator.
NYPD cop John McClane's plan to reconcile with his estranged wife, Holly, is thrown for a serious loop when minutes after he arrives at her office, the entire building is overtaken by a group of pitiless terrorists. With little help from the LAPD, wisecracking McClane sets out to single-handedly rescue the hostages and bring the bad guys down.
John McClane is an off-duty cop gripped with a feeling of déjà vu when on a snowy Christmas Eve in the nation's capital, terrorists seize a major international airport, holding thousands of holiday travelers hostage. Renegade military commandos led by a murderous rogue officer plot to rescue a drug lord from justice and are prepared for every contingency except one: McClane's smart-mouthed heroics.