the final scene for "split" includes the appearance of david dunn, played by willis. shyamalan included dunn there to connect "split" to "unbreakable", by showing dunn learning about the escape of "the beast" and thereby realizing that other superhumans exist, as predicted by mr. glass (jackson). in 2017, shyamalan stated although he hoped a third "unbreakable" film would be made and already had an outline prepared, "i don't know what's going to happen when i go off in my room, a week after this film opens, to write the script."