Board Thread:General Discussion/@comment-4854965-20141112061055/@comment-4854965-20141116063830

Koldun007 wrote: Who's Chekov? Tvtropes.com can give you a better idea.

Pretty much, Chekov's gun is an item that is introduced early on in the story (ex episode 1) and makes a comeback and is used in the plot by the end of the story (ex episode 20). The original concept relates to removing any non-relevant information, and the example Anton Chekov gave was that a gun introduced in the first act of a play must be fired by the last act.

http://tvtropes.org/pmwiki/pmwiki.php/Main/ChekhovsGun