The church considers OT III confidential material. But there are numerous science-fiction references in Scientology texts available to members of all levels. The official "Glossary for Scientology and Dianetics" includes an entry for "space opera," a sci-fi genre that the glossary says "is not fiction and concerns actual incidents." Scientology's "Technical Dictionary" makes reference to a number of extraterrestrial "invader forces," including one, the "Marcab Confederacy," explained as a vast, interplanetary civilization more than 200,000 years old that "looks almost exact duplicate [sic] but is worse off than the current U.S. civilization." Indeed, as even Rinder himself points out, Hubbard presented a rough outline of the Xenu story to his followers in a 1967 taped lecture, "RJ 67," in which he noted that 75 million years ago a cataclysmic event happened in this sector of the galaxy that has caused negative effects for everyone since. This material is available to lower-level Scientologists. But the details of the story remain secret within Scientology.