Ever since the dawn of humanity, there has been a rare few people who have weilded power that defied rational explination. These people were called by many names, witches, warlocks, sorcerers, wizards, wise men, gods. But whatever the case these inviduals became the basis of numerous legends that have spread throughout history. This power which these people weilded would later be classified as "Psionics".
Psionics was rare enough that most failed to acknowledge its existence. While some psionicists created pagan cults and religions most did not wield mastery enough than to pull off some minor tricks, many that could easily rationalized. A few governments did acknowledge these rare individuals and during the second world war both the Nazis and the Allies started their own programs harnessing these individuals. After the war and seeing the power of Psionics first hand, the PSID (Psionic Scientific Investigation Division) was founded. Knowing if the world knew about Psionics it would drive nations into utter panic it was decided that the existence of psionics would be kept under wraps. Psionics would be rounded up and monitored and any Psionic disturbances would be swept under the rug.
When drawing on the power of Psionics as an asset, it was discovered by the PSID that there was other threats to the world than just Psionic users. There was numerous alien races that have infiltrated society and secretly pursuing their own agendas. Many of these Aliens bearing powerful technology and/or psionic powers and thus were a danger to the world at large. Thus the PSID was forced to extend its operations to also counter the numerous alien threats that lie hidden from the world.
Fortunately for the PSID, Psionic users were extremely rare among the human population. Until the "Event" hit in the year 1990. A powerful solar flare struck the earth bathing the world in increased cosmic rays. While not immediately apparent the number of Psionic Users has increased tremendously. What is worse that some manifested dangerous and uncontrolled powers, allowing them to create psionic manifestations of their ID creatures. The PSID now must work to not only keep the existence of Psionics under wraps and fight against the alien threats but also deal with the increasing number of Psionic users with unstable psionic powers. Only the agents of the PSID stand between the world and utter chaos.