Tweedle Dee and Tweedle Dum are characters from Disney's 1951 animated feature film Alice in Wonderland, originally featured in the original book's sequel Alice Through the Looking Glass.
A 30 minute short film where after the animators at Disney Studios leave for the day, suddenly Mickey and Minnie jump out of the pictures and round up all the animated Disney characters in history for one giant group photo after 100 years.