28 Days 
A highly contagious, aggression-inducing virus called "Rage" is unleashed in Great Britain after an infected chimpanzee is freed from a laboratory in Cambridge by a group of animal liberation activists. It spreads rapidly and becomes an epidemic, resulting in societal collapse. 28 days after the initial outbreak, bicycle courier Jim awakens from a coma in St Thomas' Hospital in London, which has been deserted with signs of catastrophe. Jim is attacked by infected humans, but rescued by survivors Selena and Mark. At Jim's request, the group travels to his parents' house in Deptford, where he learns that they died by suicide. That night, Mark gets a cut on his arm which is hit with infected blood during an attack, prompting Selena to kill him before he turns.
Another 28 days later, Jim recovers at a remote cottage in Cumbria, where the infected are shown dying of starvation. As a Finnish fighter jet flies overhead, Jim, Selena, and Hannah unfurl a huge cloth banner spelling the word "HELLO". The three survivors optimistically watch the jet as the pilot spots them.
Gwen Cummings is an alcoholic who spends her nights in a drunken haze with her boyfriend, Jasper. They arrive late and disheveled to her sister Lily's wedding, where Gwen knocks over the wedding cake and drunkenly steals a limousine, crashing into a house. Given a choice between jail time or 28 days in a rehab center, she chooses rehab.
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Cut to Serenity Glen, where Gwen has been sentenced to 28 days of rehab in lieu of jail time. The PA system makes a running commentary out of "MASH"-style announcements. The patients do a lot of peppy group singing (too much, if you ask me). "I don't have a health problem," Gwen protests. "I play Ultimate Frisbee twice a week." The patients include the usual cuckoo's nest of colorful characters, although they're a little more plausible than in most inmate populations. We meet Daniel (Reni Santoni), a doctor who pumped his own stomach to control his drinking and wound up giving himself an emergency tracheotomy. Gerhardt (Alan Tudyk), prissy and critical, a dancer and coke addict. And Andrea (Azura Skye), Gwen's teenage roommate.