After a 15-year hiatus, David St. Hubbins, Nigel Tufnel, and Derek Smalls are drawn back together for one final show and documentary filmmaker Marty DiBergi is again on hand to explore what the band members have been up to and immortalise the concert reunion.

Joined by music royalty Paul McCartney and Elton John, Spinal Tap wrestle with their checkered past to put on a show that they hope will solidify their place in the pantheon of rock 'n' roll. Will this concert be their triumphant return, or just another Stonehenge-sized catastrophe?