This is a frequently asked question on Google. I’m providing an answer here.
Disney’s Sensational Six refers to the main Disney characters in the original short cartoons and TV series.
This includes Mickey Mouse, Minnie Mouse, Donald Duck, Daisy Duck, Goofy, and Pluto.
Mickey Mouse was the first of the Sensational Six, appearing in the 1928 cartoon Steamboat Willie. Daisy Duck was the last to appear, when she made her debut in the 1940 cartoon Mr Duck Steps Out.
Donald Duck did have a temporary romantic interest called Donna Duck in the 1937 short Don Donald, but she is not considered part of the main group.
Over the years, the Sensational Six have appeared together in numerous cartoons and TV shows, most recently including Mickey Mouse Clubhouse, Mickey Mouse Funhouse, the Wonderful World of Mickey Mouse, and Mickey Mouse Mixed-Up Adventures.