Children with their musical instruments are able to drive lazy Martin out of the furnace and punish him for his laziness.
| Directing | Hermína Týrlová | Director |
| Camera | Míla Bráníková | Director of Photography |
| Writing | Hermína Týrlová | Screenplay |
| Editing | Zdeněk Stehlík | Editor |
| Production | Dušan Schaffer | Production Manager |
| Writing | Josef Menzel | Screenplay |
| Sound | Štěpán Koníček | Conductor |
| Writing | Hermína Týrlová | Story |
| Visual Effects | Václav Dobrovolný | Animation |
| Art | Zdeněk Miler | Art Designer |
| Visual Effects | Jan Dudešek | Animation |
| Sound | Zdeněk Jonák | Original Music Composer |