Riddick begins with Vin Diesel exiled to a desolate planet, where he hatches a plan to steal a ship belonging to bounty hunters. If you know the series, you know that Riddick is wanted for multiple murders that were not really his fault.
Besides the bounty hunters, Riddick is on a planet full of giant scorpion mud monsters who get hungry when it rains - and it rains a lot.
Muttering like Sty Stallone in his prime, Vin Diesel strings together a sci-fi, slasher, and monster movie that wears its 'R' rating like a badge of honor.
Two stars - Riddick will have its fans, and you know who you are.
Weekend best bets: Blue Jasmine, Fruitvale Station, and The Butler.