Warning: Full spoilers for the episode below. "Talk about flinging dookie." Whereas last week's X-Files chapter was a trippy, quasi-meta thriller with tenuous ties to background mythology, "Plus One" was a return to basics - with creator Chris Carter crafting a "spooky lethal circumstance of the week"-type tale about nutso twins who cause people to mysterious die at the hands of their own doppelgänger. Sure, there were a few things to lament here and there.