At some point in wizarding history, a Hogwarts student passing through King's Cross Station either entering or leaving Platform Nine and Three-Quarters dropped a suitcase filled with newt spleens on the station floor, attracting the attention of Muggles. Undercover British Ministry of Magic, who patrol the station to deal with incidents like this, presumably modified the memories of those who witnessed this event.
- Pottermore (First mentioned)
- Wizarding World (Mentioned only)
- Harry Potter: Hogwarts Mystery (Mentioned only)
- Harry Potter: Wizards Unite (First appearance)