Alone Down There

"All the stars are projectors, yeah
Projectin' our lives down to this planet Earth"

What if 3GS escaped Meeple Headquarters? What if 4S didn't need to sacrifice himself?
And what if they, along with Mephone, Mepad, and Mepod Nano, All reunited.
However things won't stay peaceful for them all. As a new threat looms.