Here's the full episode of Season 2, Episode 3 of Family Guy, Da Boom! 

Plot: Peter's makes the family cancel their New Year's Eve plans because he's paranoid about the millennium.  But when Y2K hits and the world is destroyed, all that remains standing is a Twinkie factory.  When the Griffins set out to find the factory, they realize it's the end of the world as they know it.