When Leonard Betts's body disappears from the morgue after being decapitated in a violent accident, Special Agents Mulder and Scully are called in to investigate the situation. Mulder has a theory that Leonard has the ability to regenerate himself. But Scully believes that someone is taking extreme measures to cover up what really happened.
While Mulder chases his headless suspect, Scully does some investigating of her own. And before long, she learns the unbelievable truth about Leonard Betts--as well as a frightening secret about herself.