Empress Miasma is High Ruler of one of the nicest moons of Incredulus 4.
She came to Earth to spearhead an invasion by the Fourth Incredulans, hoping to make a name for herself and get promoted off her moon to a job on Incredulus 4 itself.
What she didn't notice was that although Earthlings looked the same size as Fourth Incredulans, they were just very very, far away. In fact, Earthlings are approximately one million times bigger than the average Fourth Incredulan. What an intergalactic bummer.
As she piloted her spaceship through Earth's atmosphere and down to the surface, she found herself in Beanotown, where she was immediately swallowed by Gnasher.
Miasma is now lodged in Gnasher's tummy, locked in battle with his immune system as it sends countless hungry gnashing antibodies to fight her off.