Clark must protect Lex from a deadly, invisible force; Lana looks to Clark for companionship after Whitney pushes her away.
Scully seeks Mulder's help after a fellow agent's personality begins to resemble that of a criminal her colleague killed in a bank robbery.
Lana experiments with a dangerous serum that allows her to flatline and see her deceased parents again.
It's the one year anniversary of Jon's death and everyone reflects on how much their lives have changed over the last year. But for Eddie, his dream opens up a new mystery.
On a world where males have been rendered impotent, females eager to repopulate greet the male sliders as "love gods.".