FBI Assistant Director Walter Skinner is the prime suspect in a homicide involving a woman he was with the night of her death. Mulder and Scully are all he has to prove his innocence, as superior officers try to shut him down and the only clue is a mysterious old woman.

The continuing search for Jeremiah Smith leads Scully to uncover encrypted data files whose purpose is not yet known. Being closely hunted by an unknown assassin, Jeremiah leads Mulder to a secluded farm in rural Canada while men in suits determine Mrs. Mulder's fate.

1957年某晚，居住在美国加州莫哈维沙漠小镇中的天文学家泰德•刘易斯博士（艾瑞克•麦柯马克 Eric McGormack 饰）正为爱妻拉娜（乔蒂•汤普森 Jody Thompson 饰）准备结婚周年纪念的烧烤晚餐，突然发现一颗流星从天而降坠毁在不远处的小山坡上。同样目睹流星飞过的还有小镇餐馆女服务员泰米（詹妮•拜尔德 Jenni Baird 饰）。泰德前去查看，发现“流星”竟是一艘外星飞碟，自己也被外星人“厄普”俯身。厄普在泰米的帮助下全力搜寻逃匿的独眼外星怪兽“格塔”，却依然赶不上“格塔”吃人的速度。更可怕的是，一旦“格塔”开始以几何级数速度分身，将陷整个地球于不可挽回的危险之中。