Which Harry Potter film first featured Jim Broadbent as Horace Slughorn?

Harry Potter and the Half-Blood Prince first featured Jim Broadbent as Horace Slughorn.

Slughorn is a former Hogwarts Potions professor who returns to the school in the sixth film. He is known for collecting connections with talented or influential students, a social network he calls the Slug Club. Broadbent played the character throughout his appearance in the film series.

Slughorn is important to the plot because Harry and Dumbledore need the memory he has altered concerning Tom Riddle. The memory reveals that Riddle asked about splitting the soul through Horcruxes, making Slughorn a key source of information about Voldemort’s past.

The character does not appear in the earlier films, even though other Hogwarts professors recur from the beginning. The film was released in 2009 and was directed by David Yates.