Operation F.I.N.I.S.H. is a fan fic story based 5 years after Operation INTERVIEWS, written by Genincat.
It involves her KND alais Numbuh 539, along with the former members of the KND, in a final showdown with Father, The Steve, and the Teen Ninjas. It also explains the beginning of the actual TND and its purpose. (NOTE: this website TND has a different purpose than the TND in the story).
As of 5/22/10, there are 9 chapters, and each has a picture to match (note Genincat drew each of them). Operation FINISH is still in progress.
Introduced in this story is the idea of the KND Ring, created while Numbuh 5 was Supreme Leader. Information on the Ring, its secret meaning, and how to make your own can be found here