Christopher Guest, Michael McKean and Harry Shearer reprise their roles as members of the fictional British heavy metal band Spinal Tap in this mockumentary comedy sequel directed by Rob Reiner. After 15 years, Spinal Tap are forced to reunite and perform one last concert in New Orleans. Film-maker Marty DiBergi (Reiner) returns to explore their activities during their hiatus and to capture the reunion on camera, but will the concert be a triumph or a disaster?