Mickey Mouse was created in 1928. Mickey Mouse is one of the world's oldest and most famous vermin in the world - rubbing shoulders with everyone from Goofy to Britney Spears. Mickey Mouse was created to replace an earlier Disney character, Oswald the Lucky Rabbit, who bore a striking resemblance to early Mickey drawings. Mickey originally appeared in silent cartoons, but by the end of 1928 he appeared in the cartoon Steamboat Willie, which featured synchronized music and sound. Streamboat Willie acutally found a distributer before Plane Crazy did, so it's often considered Mickey's true "debut." Mickey whistled and made other noises in the short but didn't actually speak until 1929.
Mickey continued to grow and evolve throughout the 20th century, moving into comic strips, feature films, video games, theme parks and a ton of games and toys. He first appeared in color in 1935, in the cartoon called "The Band Concert". He got his now-standard gloves in the 1929 short The Opry House. Mickey's appearance changed steadily from his creation onwards.