It's at least a decade after "the zombie apocalypse",though these zombies are a bit different. At a military bunker in England scientists, guarded by soldiers, are trying to find a cure for the contagious fungus that has transformed the majority of people into "hungries". They have about twenty ten-year-old children captive and when they are not kept locked up in cells are fasted securely to wheelchairs. Although they seem normal as soon as they smell a human they start biting and attacking. There is one child, Melanie, who is different and can somewhat transform her hunger. A teacher, Helen Justineau (Gemma Arterton) has become very emotionally attached to her because she displays emotion and creativity. However, Dr Caldwell (Glenn Close) simply views these children as a means to a cure for the fungus infection and wants to dissect her. Just as she's about to put Melanie under in the lab the walls of the compound are breached by the infected and the survivors try to get to another safe zone. Along the way they see that the fungus reproduces by growing huge vines on which big spore pods grow. If these pods explode they will contaminate everyone with the virus since it will be airborne.
Although this is basically a zombie movie it has a lot of good things going for it, from the acting to the characters and interesting script. This is the movie that I AM LEGEND should have been. Highly recommended.