query: When did Disney introduce Mickey Mouse?
passage: Mickey Mouse
Disney had Ub Iwerks secretly begin animating a new cartoon while still under contract with Universal. The cartoon was co-directed by Walt Disney and Ub Iwerks. Iwerks was the main animator for the short and reportedly spent six weeks working on it. In fact, Iwerks was the main animator for every Disney short released in 1928 and 1929. Hugh Harman and Rudolf Ising also assisted Disney during those years. They had already signed their contracts with Charles Mintz, but he was still in the process of forming his new studio and so for the time being they were still employed by Disney. This short would be the last they animated under this somewhat awkward situation.[1]
passage: Mickey Mouse universe
Duffy the Disney Bear joined the American Disney parks on October 14, 2010. He was welcomed at Epcot in Walt Disney World and Disney California Adventure Park at the Disneyland Resort. He then joined Hong Kong Disneyland Resort on November 19, 2010. He was welcomed at Main Street, U.S.A. in Hong Kong Disneyland Park. He joined Disneyland Paris on June 2011. He made his official debut in Disneyland Paris at Disneyland Park on November 7, 2011, for its holiday season. He has his own character greeting area and photo location in Town Square. He has a character greeting location at Disneyland Hotel and at Disney's Newport Bay Club Hotel. He participates in the daily daytime parade "Disney's Once Upon a Dream Parade" in the Christmas unit "Dreams of Christmas". He is also at the daily nighttime show "Christmas Tree Lighting Ceremony".