After the body of a decapitated EMT disappears from the morgue and an identical man starts work at the same hospital, Mulder believes that the man has the ability to regrow parts of his body, including his head. The agents soon discover that Betts' body is riddled with cancer and he is able to live in that condition but needs to feed on cancerous tumors to keep up his strength.

Two scientists confer about each of their metal objects that were found in Africa and they theorize that the objects are pieces of a puzzle which could be undeniable proof that human, plant, and animal life did not originate on this planet. When one of the scientists is killed and the objects are stolen, the agents investigate and Mulder begins to experience severe neurological pain caused by the objects.

A young man who has gained the ability to move faster than the eye can see begins to use his new power to kill his enemies, including the local sheriff who happens to be his father.

An Indian mystic whose son died in a chemical plant accident smuggles himself into the United States and takes his revenge on two families in suburban Washington, D.C.