On one of the "films" where Turtles are hunting a gun which can make splinter into a human again.

The turtles finds the technodrome, and begin to climb up in a rope along the side of it, then footsoldiers comes out and preparing to shoot them, then they show a picture of all the turtles hanging in the rope, ALL of them, and Donatello should not be there, cause he went away earlier in the movie to build the zippelin which he comes with later...