Battleship – a Hollywood leviathan, set for worldwide launch this month – is not to be confused with American Battleship, which (save the date) comes out on DVD on 22 May. But just so there is no confusion, Universal Studios are currently suing the makers of the mockbuster . This, no doubt, will be the mother of all legal battles, in which the big guns are wheeled out, the sea runs red, and men come home as heroes