As you enter the Magic Kingdom, look right towards Town Square Theater at the start of Main Street U.S.A. You may see Minnie Mouse wearing a red and white polka-dot dress and a huge smile. She is thrilled to meet you! Minerva Mouse, best known as Minnie, was introduced in 1928 by Walt Disney Studios in “Steamboat Willie.” Mickey’s sweetheart has appeared in more than 70 Disney cartoons and animated features plus the “Mickey Mouse Clubhouse.”