Stop-motion animation. A comet is hurtling towards Earth. Moomintroll and friends travel to a mountaintop observatory to investigate.
| Actor | Role |
|---|---|
 Zinoviy GerdtMumi-troll, Mummi-papa, Snusmumrik / Муми-тролль, Муми-папа, Снусмумрик, рассказчик | Mumi-troll, Mummi-papa, Snusmumrik / Муми-тролль, Муми-папа, Снусмумрик, рассказчик |
 Olga GobzevaSniff, Mumi-mama / Снифф, Муми-мама | Sniff, Mumi-mama / Снифф, Муми-мама |
 Zinaida Naryshkina(voice) | (voice) |
 Yuriy Yakovlev(voice) | (voice) |