It was a normal summer day in Ponyville, then suddenly magic stopped working, unicorns lost their powers, pegasuses couldn't fly anymore and earth ponies 's strength dropped.
However that situation was only temporary as strange machines started to appeared, first isolating the town and then teleporting it onto another planet, leaving a crater behind.

Equal scenarios happen also on Earth and on multiple planets around the galaxy, each having one thing in common: hosting sentient life.

Something is collecting sentient specimens from different worlds and depositing them onto one.