On the third planet of the Sol system in the Milky Way galaxy, there lives a remarkable species. Known as humans, this race has the incredible ability to change reality through the power of belief. When enough humans believe something is true, it becomes true. The stronger their belief, the stronger the effect. No other species in the universe can interact with metaphysical energies the way humans can.
For millennia, alien races have traveled to Earth in order to exploit this power. In days long past, a few thousand credits could get you anything you dreamed of: eternal youth, control over nature, clairvoyance - even the power to transform others into animals, if that's what you wanted. When enough humans believed it, it became true, and convincing them wasn't much of a challenge.
That all ended once the Federation figured out what was happening. Travel to and from the Sol system was heavily regulated, and Earth became the most locked-down planet in the universe. On top of that, humans are advancing, and convincing them of the impossible has gotten more difficult than ever. This hasn't stopped the flow of fortune-seekers, who even today will give up everything to get a ticket to Earth, and a chance to get something no other planet can provide.