Scrooge McDuck decides to write down the code of his new safe, and hides the paper in a locket. Meanwhile, Donald Duck and his nephews decide ro offer him a pet, who happens to be a lemming who sadly takes the locket aways and flees. Scrooge and his nephews have to run after him. But everything becomes harder when the lemming joins a migration of thousands of identical lemmings…
- This storu was first published in july of 1955 in Uncle Scrooge n°9.