Kansas is where it's all happening.

Agents looking and acting eerily like Mulder and Scully knock on the door of the first woman (red car, cable guy), Betty Templeton. They're investigating whether she has a doppelganger and why there was such a burst of violence among the normally peaceful proselytizers, who now wait in the agents' car.

Templeton is vague until the lookalike woman passes by in a car. Suddenly, the Mulder and Scully analogs get into a brutal fight. "Scully" drives off with "Mulder" hanging on the car door. They crash.

We next see Mulder and Scully looking at slides of their duplicates in an attempt to find out what happened. Scully, irritated at playing second fiddle, takes the lead in spouting hypotheses about mystical doppelgangers, bi-location, and such.

Lulu Feifer, Betty's lookalike, applies for a job at an office supply store. The manager is disturbed that she's had 13 jobs in the past three years and is constantly moving. But then the place erupts in chaos -- machines spitting out copies and so on -- and he hires her on the spot.

Mulder and Scully visit a man in a cheap hotel room. He's Mr. Zupanik, a semipro wrestler who's been associated with one of the women. He says little.

Zupanik goes to a bar and promptly mistakes one of the lookalikes for the other. When both women are on premises, bottles shake and shatter. Chaos.

Mulder calls Scully, lets her know that another man, Argyle Saperstein -- one of Zupanik's associates -- might help them.

Scully discerns that Betty and Lulu, despite having no clear relationship, have moved from city to city in tandem. Unfortunately, they raise havoc everywhere they go.

Saperstein has some kind of shady deal going with "Titanic" Zupanik. He presses the wrestler for money.

Zupanik is now involved with both lookalike women, even while worrying about financial matters. When mindless mayhem erupts in a bar, he loses his briefcase filled with money. He then, separately, encourages both women to go get some more money. It’s his last chance to make it big.

One of the women goes to the office supply store where she works and starts photocopying cash.

The agents question Zupanik. Mulder goes to see Betty, who angrily blames everything on Lulu.

Scully, who speaks separately to Lulu, discerns that there's a psychic connection between the two women. Mulder is vaguely sarcastic on the phone.

When the two women's cars are in proximity, a manhole cover blows off and Mulder is sucked into the storm drain. The lid then falls back into place, steaming ominously.

Scully comes looking for Mulder, can't find him, decides to go surfing the Internet instead.

Having gathered important data, she goes to the penitentiary and meets a chronically angry prisoner. He's the father of the two women, through donations to sperm banks. He rages.

Mulder emerges from the storm drain, calls Scully. She says someone had better get to Zupanik's upcoming wrestling bout to keep the chaos-causing half-sisters apart. Mulder says both love Zupanik.

Scully, on phone, wanders down prison hall and finds another inmate. It's Zupanik's double.

Fight night. Saperstein demands money from Zupanik. Betty shows up with a bag of counterfeit cash. Zupanik, in red costume, starts wrestling a dark-clad opponent. Lulu shows up with another bag of phony money.

The doppelgangers are in sight of each other. The crowd starts getting violent. Mulder puts one of the women across his shoulder and runs through the arena.

Scully walks in with guards and the handcuffed Zupanik-double. Zupanik and his double stare at each other in rage. There's more chaos.

Later, Scully and Mulder review their findings. Scully notes that there are 50 million donations to sperm banks each year, but fortunately, few have the consequences seen here.

She notes that both Zupanik and his sibling were wrestlers who also robbed banks. The odds were 21 million to one that they would ever meet each other. As for the women, they met 12 years ago.

Perhaps, says Scully, this all has to do with balance in the universe. Or maybe nature makes only so many originals, and usually scatters them around various countries.

Mulder agrees.