Assuming that they are merely victims of a huge earthquake and that the Army will soon rescue them, the stars -- with no personal assistants to advise them -- fail repeatedly at prepping. An ax-wielding Emma Watson (Hermione of the Harry Potter movies) briefly shows up, having impressively survived what she cogently argues must be the Zombie Apocalypse, but soon ditches the male losers.
The not very masculine actors spend most of their time smoking weed and arguing over their friendships like junior high school girls. (It seems trivial, but, actually, 9 figures of money are at stake over whether Franco and Rogen decide to do Pineapple Express 2 together.)
Rogen once again somehow makes himself being reasonable while beset by psychopaths funny (although not as funny as an interview he and Barbra Streisand did last Christmas with Dr. Phil to promote their movie in which they play son and mother, an interview in which Babs was her usual megalomanical self and Seth tried, ineffectually, to return her to the level horizon of reason and self-awareness).
Only the 3/4ths gentile Jay Baruchel and the black Robinson notice the obvious parallels of what's happening to Los Angeles to the "Book of Revelation" in the New Testament, a tome with which Rogen, Hill, and Franco are blankly unfamiliar.