dangler

Dangler is a literary term meaning a plotline that is metaphorically left to "dangle" or "hang". A dangler, or dangling plotline, is a plot device in fiction where a plotline is forgotten, phased out and eventually dropped, thus a resolution is never achieved. Although dangling plotlines can occur in all forms of media, they typically appear in comic books, movies and book sequels, where the original writer or creative team can be replaced.

View More On Wikipedia.org