The fourth in the series of films this time taking a comical crack at alien invasion movies. Cindy has lost her husband since the events of the previous film and is visiting her brother-in-law Tom. A depressed Tom later tries committing suicide and does so comically. A distraught Cindy then decides to take care of a frail old lady who gets a new neighbor that turns out to be friends with all of Cindy's old friends. Chaos ensues when a mysterious force causes all the city's vehicles to stop working and the group learns of yet another alien invasion about to occur.