Here's a sneak peak from the game designer.
Game description from the publisher:
It's the end of the world!
In Munchkin Apocalypse, a 168-card standalone game that can be mixed and match with other Munchkin games, every possible natural (and unnatural) disaster has happened. You are a rugged survivor in a world full of people -- and things -- that want to kill you and take your stuff. So do it to them first!
And what's with all these seals running around? Don't they know the world's about to end? You should really keep an eye on that seventh one in particular...