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A [http://en.wikipedia.org/wiki/Revenant_(folklore) revenant] is a visible [[ghost ]] or animated corpse that returns to terrorize the living, usually people it knew in life. Unlike the [[zombie]], a revenant is not under another person's control, and has returned from the grave on its own for a specific and often personal purpose.

In [[4.01 Lazarus Rising]], [[Bobby ]] accuses [[Dean ]] of being a [[shapeshifter ]] or a revenant. Dean proves he's neither by cutting himself with a [[silver ]] knife.

In [[8.06 Southern Comfort]] [[Garth ]] takes a call from a hunter asking how to deal with a revenant. Garth tells him to get a casket and some [[silver ]] spikes, then nail it in and bury it. He also warns that getting bit will hurt like hell, but will not turn you into one.