This documentary tells the story of the creation and cultural impact of the world's most famous Christmas carol, composed in 1818 in Salzburg, Austria, and since then translated into about 140 languages.
| Actor | Role |
|---|---|
 Peter SimonischekNarrator | Narrator |
 Kelly ClarksonSelf | Self |
 Joss StoneSelf | Self |
 AnggunSelf | Self |
 Josh GrobanSelf | Self |
| LLina MakhoulSelf | Self |
 Gavin RossdaleSelf | Self |
| CClifton MurraySelf | Self |
| FFraser WaltersSelf | Self |
| VVictor MicallefSelf | Self |
 David FosterSelf | Self |
| AAnna NetrebkoSelf | Self |
 Rolando VillazónSelf | Self |
 DJ ÖtziSelf | Self |
| AAlfred JaklitschSelf | Self |
 Paul FalkSelf | Self |
| MMax FalkSelf | Self |
| DDieter FalkSelf | Self |
 John DebneySelf | Self |
 Siedah GarrettSelf | Self |
| WWiener SängerknabenSelf | Self |
 John Rhys-DaviesDouglas Haig | Douglas Haig |
| SSassy HolzingerSelf | Self |