The Search of Mickey Mouse
The Search of Mickey Mouse was a planned animated film from Disney. It was announced to commemorate Mickey Mouse's 75th birthday. 
The premise is about Mickey Mouse is kidnapped by unknown forces, forcing Minnie Mouse to enlist Basil of Baker Street to investigate his disappearance. Along the way, they encounter one character from Disney's animated film canon including Alice, Peter Pan, Robin Hood, and Aladdin .
After the film was announced, no new info was released about the film. This caused many people to believe that the film was cancelled. In an unknown day in 2005, it was announced that it would be released in 2012, as Disney's 50th animated feature. When the time came, and Tangled became Disney's 50th animated feature in 2010, it was unknown if the project was still alive or completely cancelled.
Why It Was Cancelled
- As of right now, the cancellation reason is because the project suffered script problems with the multiple cameos being deemed as too complex.
- The film was shelved and replaced with a new feature film, Mickey, Donald, Goofy: The Three Musketeers.