"Kitten" is the sixth episode of the eleventh season of the American science fiction television series The X-Files.
In 1969, during the Vietnam War, a platoon of U.S. Marines including Walter Skinner and John "Kitten" James are tasked with escorting a crate marked "MK-NAOMI" to a rendezvous point.
They come under enemy fire as they reach the landing zone and are forced to take shelter with a group of civilians in a hut.
As Skinner doubles back to help a wounded soldier, the crate is damaged by gunfire and Kitten is exposed to a green gas.
In the present, Fox Mulder and Dana Scully are called before FBI Director Alvin Kersh, who informs them that Skinner has vanished without explanation.
Scully questions the sheriff about a mass hysteria gripping the town amid claims of a monster lurking in the nearby woods and people inexplicably losing their teeth.
Mulder and Scully lose the support of local authorities when they admit Skinner is their boss, and are unable to convince the sheriff that he is innocent.
Davey reveals that all of the soldiers exposed to MK-NAOMI were sent to the same facility and continued to be experimented on, implying that Kitten's initial exposure was orchestrated by the government.
Initially an attempt to turn soldiers into more efficient weapons of war by channeling their fear into aggression, the scope of MK-NAOMI was expanded to become a means of controlling peoples' minds.
The agents ostensibly accept his explanation and leave, but Mulder suspects Davey after noticing photos of Kitten and Skinner in his cabin.
In the epilogue, a crop duster is seen spraying a field with a green gas as Davey's warnings about government conspiracies are repeated in voiceover.