Actor / Character Comparison Still - The Mad Hatter and Ed Wynn

Never has Disney cast a better voice.  Ed Wynn's lispy Hatter is just fantastic.  And his improv skills proved better than the writers as his live action reference footage from the Mad Tea Party was so good, they used it as the vocal track rather than the studio recorded version.

While he later went on to portray Uncle Albert in Mary Poppins, he will always be the Mad Hatter to me.