Stitch

Stitch was a character in a Disney film seen by Rory Williams and the Doctor. He said "No one gets left behind." The Eleventh Doctor once found a relevant use for the quote, beginning with "As my old friend Stitch once said..." (PROSE: The Glamour Chase)

Behind the scenes

Stitch is from the Disney animated film Lilo & Stitch.
In Battles in Time Magazine #24, one question in the multiple-choice Gridlock Quiz asks the names of the characters Martha accompanies in the car when the Macra attack. The options are: a) Milo and Cheen, b) Lilo and Stitch, or c) Valerie and Brannigan.