The Hans of Fear

In 19th-century Copenhagen, a young boy named Erik spots what appear to be floating snowflakes in midair that he nicknames "frost bees" while walking with his mother, but she tells him off for seeing things as it is a midsummer's day. However, a passerby notices a whirlwind approaching from the north that freezes everything it touches, including the sea itself. A nearby sailor spots something else in the blizzard too - a blue box.