A Mickey Mouse comic strip was suggested by Joseph Connolly, the president of King Features Syndicate, in a July 24, 1929 letter to Disney animator Ub Iwerks: "I think your mouse animation is one of the funniest features I have ever seen in the movies. Please consider producing one in comic strip form for newspapers. If you can find time to do one, I shall be very interested in seeing some specimens." The Disney team was busy producing new cartoons, but by November, samples of the new strip were approved by the syndicate. The comic strip launched on January 13, 1930, written by Disney himself, with art by Ub Iwerks.
The strip begins with young Mickey as an optimistic, imaginative young mouse living on a farm, and dreaming of becoming a great aviator like his hero, Charles Lindbergh. In a sequence based on the 1928 short Plane Crazy, Mickey puts together a homemade plane, and takes a flight with his girlfriend Minnie. She falls out of the plane, and Mickey travels through a storm to land on a deserted island, inhabited by fierce natives who want to cook him alive.
As these first strips were being released in January 1930, Iwerks left the Disney studio, signing a contract with Disney competitor Pat Powers to leave Disney and start an animation studio under his own name. Win Smith, who had been inking the strips, took over the pencilling as well with the February 10th strip. Smith left the studio in April after a fight with Disney, who wanted him to take over writing the strip. As a "temporary replacement", Disney asked a young inbetweener at the studio named Floyd Gottfredson to fill in. Gottfredson's first strip was published on May 5, and he took over the scripting two weeks later. He would continue as the creative force of the strip for more than 45 years.
While the early months of the strip did have a loose plot, the pace and style were still the standard gag-a-day approach to comic strips. With adventure and daily continuity strips like The Gumps and Wash Tubbs becoming increasingly popular, King Features Syndicate asked Disney to make Mickey Mouse a more serious adventure strip.
This led to the first adventure storyline, "Mickey Mouse in Death Valley", which ran from April 1 to September 20, 1930. The story—begun by Smith, and continued by Gottfredson—involves a crooked lawyer, Sylvester Shyster, and his thuggish associate Peg-Leg Pete, who kidnap Minnie in order to find a map to her Uncle Mortimer's hidden gold mine in Death Valley. Mickey and Minnie race Shyster and Pete to the desert, to lay claim to the mine. The story runs through a number of Western melodrama tropes—a desperate horse chase, gunplay, a crusty old sheriff, the heroine getting locked up in a jail cell, the hero unfairly branded an outlaw. Over six months, Gottfredson made it clear that Mickey Mouse could deliver action and thrills.