The duo arrive in Oregon again. They’ve been sent because of a series of events revolving around a pair of fraternal twins, a teenage boy and girl, who, according to locals, ‘just went crazy.’ They meet a pair of DEA agents named Scullder and Mully who have been working on an adjacent case. The town is the home of a mirror factory, and loaded with art made from mirrors. Teens in the town seem to display odd behaviour, almost psychic, but only after partying. Scully immediately asks Milder if this is demons from mirror dimensions, and Mulder decides on no evidence that it’s something mundane.

As the investigation progresses, the twins turn out to have been on a new drug, developed by a scientist who once worked as an offshoot of MK Ultra. He has developed a pair of chirally matched designer drugs that produce shared sensation and mental connection through the ‘twin connection,’ originally intended to let American interrogators connect and ‘download’ the memories of spies and communists. Now, he just wants to make money and continue his other research. The twins were an unfortunate accident, overloading their ‘twin connection’ and scrambling their identities and bodily systems until they were melded into one mind that couldn’t control two physically different bodies, causing their ‘madness,’ ‘seizures,’ and death.