The Moomins (1978)

S1E13 The Island Expedition

Eager for adventure, Dad decides the Moomin family should set sail for a deserted island nearby. While exploring, Hemul stumbles upon the peculiar Hatiflaks, mysterious little beings that can generate electrical charges. Their odd behavior frightens Hemul, but Mumrick steps in to help chase the Hatiflaks away, restoring peace to their expedition.