When the Bearers race forth from Ponyville on an official mission, somepony has to take over on their day jobs. For Fluttershy, that's usually Snowflake. But he's not available today, so it's going to be a Sherman tank.
NO INCEST! ~~ Button needs some ponies to help with his new co-op game, but nopony seems interested. That is, until his Mum shows up at school. Now, it seems all sorts of ponies want to stay over...
Apple Bloom wants to see her parents, the Cutie Mark Crusaders want their cutie marks, so they do the the only logical thing and try to raise the dead.
The truth of the matter is, Spike didn't realize that writing The Noble Dragon Code would get him worshipped as a god but, hey, whattcha gonna do? Them's the breaks.