The Walt Disney Company and starred in several Disney produced films. Ub Iwerks refined Disney's initial design of Mickey Mouse. Disney's first sound film "Steamboat Willie", a cartoon starring Mickey, was released on November 18, 1928 through Pat Powers' distribution company. It was the first Mickey Mouse sound cartoon released, but the third to be created, behind "Plane Crazy" and "The Gallopin' Gaucho". "Steamboat Willie" was an immediate smash hit, and its initial success was attributed not just to Mickey's appeal as a character, but to the fact that it was the first cartoon to feature synchronized sound. Disney used Pat Powers' Cinephone system,
The Walt Disney Company studio's operations that the studio bought it on February 5, 1965, along with the WED Enterprises name. On December 15, 1966, Walt Disney died of complications relating to lung cancer, and Roy Disney took over as chairman, CEO, and president of the company. One of his first acts was to rename Disney World as "Walt Disney World" in honor of his brother and his vision. In 1967, the last two films Walt actively supervised were released, the animated feature "The Jungle Book" and the musical "The Happiest Millionaire". The studio released a number of comedies in the late 1960s, including