As part of some fanon I'm working on, I'm examining the hypothetical scenario of the Klingon Empire becoming part of the Federation by the mid 25th to 26th Centuries. I'm familiar with some similar threads on these forums, although I felt that my specific query would be better answered in its own thread. Established points It has been noted by various Trek fans and canon that as a warrior race, contemporary Klingon attitudes and politics are incompatible with that of the Federation (e.g. glory in battle, subjugating servitor species like Kriosians, distinct caste system) In ENT: "Judgment", Archer's Klingon advocate Kolos spoke of how Klingon society was once based on "honor [that] was earned through integrity and acts of true courage, not senseless bloodshed". Kolos also spoke of his parents, a father who was a teacher and a mother who was a biologist, who were from a generation that encouraged him to pursue law, whereas by the time of "Judgement" the warrior class had become dominant. ENT: "Azati Prime" depicts a possible future timeline where in the 26th Century, Klingons and Xindi were members of the Federation fighting against the Sphere Builders in the Battle of Procryon V. Andorian are technically a warrior race themselves, although they also had various other cultural features that made them founding members of the Federation. TNG's season one had some off-handed dialogue regarding Klingons as part of the Federation, although this was quickly retconned into having Klingons as merely close allies. Since I'd rather this thread not devolve into a debate as to whether Enterprise was a poor series / whether the Federation still exists by xth Century,I am going to assume that, for the purposes of my fanon, the first four points stand. In which case, the big question is: What events (or series) of events could lead to a fundamental shift in the Klingon Empire that would set them on the path to eventual Federation membership by the mid-25th to 26th Centuries? My current working idea is essentially a Klingon version of the Vulcan Reformation / Syrranite / Kir'Shara, in which contemporary Klingon warrior culture is in reality a warped interpretation of Kahless's (or a predecessor's) original teachings about integrity and courage. Possible subideas include: At the start, a brief state of war in 2409/2410 between the Federation and Klingons following allegations that a certain Klingon Ambassador was involved in nefarious schemes to topple the Federation (an allusion to B'vat from Star Trek Online) as well as the Klingon's outrage at the Federation refusing to help them fight Undine infiltration (again, from STO) The crew of a Klingon battlecruiser discovering a colony of Klingons who chose to live by the ancient ideals. The discovery of an artifact that contains the "true" teachings of Kahless by a group of Klingons alongside their Starfleet acquaintances Members of the Klingon High Council attempting to suppress said discoveries to preserve the status quo. Worf getting involved in some capacity, given his own interpretation of what it means to be a "true" Klingon - possibly involving the death of then-Chancellor Martok and Worf's own rise to the leadership of the Klingon people. As a result of the discovery being validated, Klingon-Fed tensions ease somewhat from the brief period of war over B'vat and the Undine to a renewed detente. Decades into the future where relations have greatly improved, the Empire beginning to emancipate its subject worlds and eventually culminating towards Worf's successor attending the signing ceremony for Klingon admittance to the Federation. As this is hardly refined, thoughts and ideas would be much appreciated.