There’s just too many damn TV box sets this month, otherwise we’d have gone into detail about PERSON OF INTEREST SEASON THREE ( 21 September, Blu- ray/ DVD). There’s a few episodes during this run of the deliciously convoluted techno thriller when the show appears to be giving us six season finales in a row. As the good machine discovers its evil twin, Samaritan, it’s a gripping battle of the AIs. Under- fives and nostalgic adults will probably get the most out of MOOMINS ON THE RIVIERA ( 28 September, DVD), a big- screen outing for Tove Jansson’s hippo- like trolls, in which the Moomin family visit the Cote D’Azure, and come to realise that the values of their life back home are far superior to all its shallow glamour. It’s a charmingly sweet tale, whose hand- drawn animation has an appealing simplicity. A crazy- bearded Matthew “Lost” Fox features in EXTINCTION ( 21 September, DVD), snowbound postapocalyptic zombie flick whose vicious undead are blind and like to slither about. Unfortunately its emphasis on character fails because the central mystery – why two former friends fell out – just isn’t interesting enough to warrant the screentime devoted to it. Finally, in DEMONIC ( out now, DVD) a detective ( Frank Grillo) looks into the deaths of students who held a séance in a house where mass murder took place. The police investigation angle and interweaving of past and present freshen things up a little, but it’s overly reliant on the usual jump scares, and the big twist ain’t much cop.