There's a race of people called Polars. Their other half has the direct opposite abilities that they have. Their brains are connected telepathically from the time they are born. The most dangerous Polar, Tyler Joseph, has been contained in a high security prison strictly for Dark Polars.
In order to save the lives of everyone Tyler infected, the feds have to find the Light Polar he corresponds to. Tyler would never give away his only ally, especially when he barely remembers him.
* loosely based on the Heathens music video and the help of @unsettledthoughts *