Dwayne Johnson transforms into UFC champion as he returns to ring for next film

Dwayne Johnson (Yui Mok/PA)

Professional-wrestler-turned-Hollywood-star Dwayne Johnson is returning to the ring to play mixed martial arts fighter Mark Kerr in his next film.

Johnson shared an image on social media of his transformation into Kerr, sitting in the corner of a ring while British actress Emily Blunt looks on.