Siblings Wednesday and Pugsley Addams will stop at nothing to get rid of Pubert, the new baby boy adored by parents Gomez and Morticia. Things go from bad to worse when the new "black widow" nanny, Debbie Jellinsky, launches her plan to add Fester to her collection of dead husbands.
Alcoholic pilot, Ted Striker has developed a fear of flying due to wartime trauma, but nevertheless boards a passenger jet in an attempt to woo back his stewardess girlfriend. Food poisoning decimates the passengers and crew, leaving it up to Striker to land the plane with the help of a glue-sniffing air traffic controller and Striker's vengeful former Air Force captain, who must both talk him down.
A faulty computer causes a passenger space shuttle to head straight for the sun, and man-with-a-past, Ted Striker must save the day and get the shuttle back on track – again – all the while trying to patch up his relationship with Elaine.
Kay and Jay reunite to provide our best, last and only line of defense against a sinister seductress who levels the toughest challenge yet to the MIB's untarnished mission statement – protecting Earth from the scum of the universe. It's been four years since the alien-seeking agents averted an intergalactic disaster of epic proportions...