BackGames is a new internet meme, and one that gamers everywhere can contribute to. The concept behind it is simple, in 25 words or less, write your own take on a game's plot, but in reverse! I'll provide a few examples to make it a bit clearer:

Asteroids:
A spaceship tends a galactic garden, growing tiny rocks into huge boulders.

Katamari Damacy:
A prince must hide the stars, by rolling them across the earth’s surface, until they break into small everyday objects.

Doom
Break out of hell and resurrect everyone with your ungodly powers.

I encourage everyone to have a go and write their own. Here's some that I wrote:

Pokemon
Embark on a quest to free hundreds of enslaved animals, and protect them from harm.

Pikmin
Deconstruct a spaceship as slowly as possible while making sure not to touch the local wildlife.

Starfox Adventures
Destroy a meaningless planet by capturing an anthropomorphic fox and enslaving its guardian spirits.

Haze
Spread word of the evils of drug addiction and war, then join the military and get high.