The Genastone is a fanfic written by Cere, starting on 27 November 2000, with publication starting at Fan Fiction Net on 23 December the same year. The story was completed on 22 September 2002. It is based on the Archie comics.
A sentient jewel, developed by the extraterrestrial Betovians species, has crashed onto Earth in Egypt. The turtles and Ninjara must stop Shredder and Rocksteady from using it for evil purposes.