An incredible series of videos swap famous Hollywood faces to demonstrate how convincing 'deepfake' tech has gotten - take a look

1. Heath Ledger's portrayal of the Joker in "Batman" is put in "A Knight's Tale" instead.

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2. Bill Hader doing impersonations on Conan O'Brien's show morphs into the person he's impersonating, Arnold Schwarzenegger.

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3. The "Fight Club" scenes offer a clearer look at the personality disorder at the center of the movie.

4. A second scene from "Fight Club" offers another look at how the tech can be used:

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5. And finally, one more with Bill Hader — this time as Al Pacino.