Bjorn, lead singer in Abbatoir, and his band mates Benny, Anni-Frid, and Agnetha spend their weekends covering Abba classics at a variety of increasingly depressing venues, from old folks’ homes to empty pub back rooms. It’s a grind and the band is ready to call it a day when Benny, the band’s oldest and most needy member, hears of a Battle Of The Bands competition for tribute bands at The Niney Dimey. As the band arrives to load in their gear, things begin to go awry rather quickly. A disturbance in the main room of the venue rapidly gets out of control forcing Bjorn and his band to take cover backstage. Some of the other bands are injured from the fracas outside, injuries which soon present a problem when the wounded begin to metamorphose into bloodthirsty undead.