Gus the young, old Swedish Elf longs to stay in Sweden but is assigned to follow a human boy Sven through all his worldly travels.   

Funny trouble happens when he appears in front of unsuspecting humans, wants to write a book about himself as

THE GREATEST TOMTE OF ALL TIME

communicates through a snow globe, learns to fight mythical beings, then shipwrecks Sven and himself on an island…where pirates live on the other side.