Human to ferret

This spell transfigures a human into a ferret. Barty Crouch Jr (disguised as Mad-eye Moody) used this spell on Draco Malfoy on the first day of the 1994-1995 school year when he tried to curse Harry Potter behind his back. Minerva McGonagall later performed the counter-curse.

Appearances
Harry Potter and the Goblet of Fire Harry Potter and the Goblet of Fire (film) Lego Harry Potter: Years 1-4