| Rob Reiner | Marty DiBergi |
| Michael McKean | David St. Hubbins (Lead Guitar, Vocals) |
| Christopher Guest | Nigel Tufnel (Lead Guitar, vocals) |
| Harry Shearer | Derek Smalls (Bass, vocals) |
| R.J. Parnell | Mick Shrimpton (Drummer) |
| David Kaff | Viv Savage (Keyboards, vocals) |
| Tony Hendra | Ian Faith |
| Bruno Kirby | Tommy Pischedda |
| June Chadwick | Jeanine Pettibone |
| Fran Drescher | Bobbi Flekman |
| Joyce Hyser | Belinda |
| Vicki Blue | Cindy |
| Paul Benedict | Tucker 'Smitty' Brown |
| Patrick Macnee | Sir Denis Eton-Hogg |
| Billy Crystal | Morty the Mime |
| Fred Willard | Colonel On Military Base |
| Ed Begley Jr. | John "Stumpy" Pepys |
| Zane Busby | Rolling Stone Reporter |
| Howard Hesseman | Terry Ladd |
| Paul Shaffer | Artie Fufkin |
An American filmmaker records the demise of a fictitious band of aging British metalheads in a mock rockumentary.
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