Sundance 2014: Infinitely Polar Bear, review Dir: Maya Forbes. Starring: Mark Ruffalo, Zoe Saldana, Imogene Wolodarsky, Ashley Aufderheide. 87 mins If you're making a movie with a bear in the title, Mark Ruffalo is a good choice as the lead, with his cuddly appearance and bumbling everyman charm. Here, he plays Cameron, a lovable sort with a beautiful wife Maggie (Zoe Saldana) and two great kids, Amelia (Imogene Wolodarsky) and Faith (Ashley Aufderheide). The only problem - as one of the children explains over some charming Super 8 footage at the start of the film - is that Cameron is bipolar. Writer/director Maya Forbes - who has based the film on her own experiences as a child - makes sure we know Cameron is a loving husband and dad before we see him experiencing a nervous breakdown in 1978. Fast-forward a few months and Maggie decides she needs to get the family off the breadline by going back to school. The only snag is that Cameron will have to look after the kids. What follows are the sometimes magical, sometimes mortifying moments of living with a bipolar parent - a situation that can end with ten unfinished artwork projects in the lounge and a kitchen full of washing up or the best flamenco skirt a child has ever seen. Forbes has a delicate but unsentimental approach, which gives her film the same infectious energy that blesses and curses Cameron. The end result feels good without feeling superficial.