Mickey Mouse

Mickey Mouse was the name of a popular American cartoon character. Captain Jack Harkness nicknamed Mickey Smith, "Mickey Mouse" when they re-encounted each other on the Dalek Crucible. (DW: Journey's End)

The Doctor being unimpressed with Disneyland and the two famous mice Mickey and Minnie, told Rose, he could take her to a place with talking mice (NSA: Winner Takes All)

Behind the scenes

 * In an interview, that can be found as an extra for The Three Doctors DVD, the writers wanted to name K-9 "Pluto" after Mickey's famous pet sidekick, but Disney did not grant permission.