Bayinbulag and Somiya are brought up, from a young age, as brother and sister by their adoptive grandmother. The three live happily in a yurt on the Mongolian steppes. Just before Bayinbulag is to leave for the city, to be trained as a vet, the grandmother suggests that Bayinbulag and Somiya should eventually marry. Bayinbulag, now training to be a musician, stays away for long periods of time without communicating with Somiya. He finally comes back expecting to marry her.
When siblings Judy and Peter discover an enchanted board game that opens the door to a magical world, they unwittingly invite Alan -- an adult who's been trapped inside the game for 26 years -- into their living room.
In the year 2035, convict James Cole (Bruce Willis) reluctantly volunteers to be sent back in time to discover the origin of a deadly virus that wiped out nearly all of the earth's population and forced the survivors into underground communities.