Little did the world know that The Darkness "Four Horsemen" comic book was actually a look into the future, of metal band Dethklok.
The resemblance is uncanny to the four horsemen of the apocalypse. I'd say its about 20 years later, Toki has turned gray and both he and Murderface have added goatees to their facial hair. Pickels has combed out his dredlocks and Nathan has been overcome by the Darkness.
They also ride motorcycles and kill people..... but I think they did that before. The original four horsemen are said to ride on white, red, pale, and black horses, very appropriate for their hair colors and/or pale skin.