The Locker of memories was probably made when Mermaid Man and Barnacle Boy were still retired because it shows things about them becoming young and their career being superheroes. It is also a time machine that shows the year, month,and day. At the end of the episode of its appearance "Back to the Past," a locker that is the same appeared with duplicates of SpongeBob and Patrick. A duplicate of Spongebob said they came because of how evil was stopped. Then, many lockers which are obviously the same appeared all over the galaxy.