The actor posted the image on his Facebook page, along with the words:
"It's been a decade since I've been to Comic-Con… Grrr… The Furyan."
The image is appropriately bloody, featuring the Furyan clenching his knife, ready for action.
Directed by David Twohy, Riddick is set for September 6 release, with promises that it'll return to the smaller scale action of the original Riddick movie, Pitch Black.
Starring alongside Vin Diesel are Karl Urban, Jordi Molla, Matt Nable, Katee Sackhoff, Bokeem Woodbine, Dave Bautista, Conrad Pla, Raoul Trujillo, Nolan Funk and Keri Hilson.