Ninja Assassin (18)

You know something about kung-fu fighting? It's fast as lightning, and a little bit frightening.

But only a little bit; when the slicing and dicing and blood-spurting become as unstoppably frenzied as they do in the course of Ninja Assassin, one's instinct is less to take fright than take 40 winks and hope to wake up when it's all over. This stars Korean pop star Rain as the eponymous assassin, a renegade ninja on the run from his cruel mentor and his army of black-masked psychopaths.

Naomie Harris plays the Europol agent – with an American accent – who's uncovered the ancient sect and must now be saved from their merciless hands by our hero. Not exciting.