There’s a fourth part of the Chronicles of Riddick franchise in the pipeline, according to a January Facebook post from star Vin Diesel, thanks to almost $100 million at the box office and brisk DVD sales for this third instalment. Writer/director David Twohy continues to steer the ship, as the 26th-century saga unfolds with Diesel’s musclebound, deep-voiced recidivist receiving a promotion along the way. He now commands the Necromonger fleet (go with it) and rules over restive subjects and everything. A voyage to an arid planet leaves Riddick injured and under attack from “night creatures” and inclement weather, then marauded by bounty hunters. This motley, multi-ethnic crew has the ring of Alien about it – and Battlestar Galactica’s Katee Sackhoff is a welcome, Ripley-like addition – but it is mainly a sequence of attacks, both internecine and external, and what we might call hardware porn. The design is excellent, and Diesel holds the whole space opera together with his booming baritone.