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- "It was a c-cat hair! M-Millicent Bulstrode m-must have a cat! And the p-potion isn't supposed to be used for animal transformations!"
- —Incorrect use of the Polyjuice potion[src]
This cat was a pet cat of the Slytherin student Millicent Bulstrode. Milicent had it with her at Hogwarts in 1992.[1]
Biography
Hermione Granger plucked a small hair of the cat from Millicent Bulstrode's robes, thinking it was hers. She added the cat's hair to the Polyjuice Potion she was brewing, which resulted in her partial animal transformation after she drank it.[1]
Behind the scenes

Hermione partially transformed into the cat after accidentally adding the cat's hair to her Polyjuice Potion
- In LEGO Harry Potter: Years 1-4, Hermione did not realise she had become the cat until Ron and Harry pointed it out.[2]
Appearances
- Harry Potter and the Chamber of Secrets (First mentioned)
- Harry Potter and the Chamber of Secrets (film) (Mentioned only)
- Harry Potter and the Chamber of Secrets (video game) (Mentioned only)
- LEGO Harry Potter: Years 1-4
Notes and references
- ↑ 1.0 1.1 Harry Potter and the Chamber of Secrets, Chapter 12 (The Polyjuice Potion)
- ↑ LEGO Harry Potter: Years 1-4