Before the events of the film, Moomin's father had finished building Moominhouse. During one rainy evening, the Muskrat suddenly appears at the front door to stay because his riverbank home had been destroyed by Moominpappa's bridge, built earlier that day. The next day, the rain's turned everything black and according to Muskrat, it is soot from outer space.
Before the film's events, Moomin's father completed building Moominhouse. One rainy evening, Muskrat unexpectedly appeared at the front door to stay due to his riverbank home being destroyed by Moominpappa's bridge constructed earlier that day. The following morning, everything was pitch black according to Muskrat, who attributed it to soot from outer space.