When Fillydelphia's parasprite problems prove too much for even Princess Celestia to handle, Filly's Head of the Guard realizes that there is no other alternative, and makes the decision to call in the cavalry: he calls in Pinkie Pie!

Pinkie is to work closely with the Head of the Guard in Fillydelphia to eradicate the parasprite infestation by any means necessary in the now nearly deserted city.

Naturally, things don't go as planned, and what should have been a simple task becomes something much, much more complicated.

The story is framed within the Head of the Guard's letter to Twilight after the incident.

Special thanks to The Only Brony in the Army for editing.