Which character says 'We're all mad here' in the 1951 film?

In the 1951 film, the Cheshire Cat says “We’re all mad here.”

The line appears when the Cheshire Cat explains Wonderland’s peculiar inhabitants to Alice. His point is not merely that the place is chaotic: he suggests that madness is part of Wonderland’s normal order, and even hints that Alice must be mad too if she has arrived there.

The Cheshire Cat functions as both guide and troublemaker. He directs Alice toward the Mad Hatter and March Hare, but he also deliberately confuses events, especially during the Queen of Hearts’ croquet game and trial. His ability to vanish, leaving only his grin, makes him one of the film’s most memorable figures.

Viewers sometimes associate the quotation with the Mad Hatter because of the character’s name and the chaotic tea party. In the 1951 Disney film, however, the Cheshire Cat delivers the line, with Sterling Holloway providing his voice.