Chang

General Chang was a notable Klingon warrior who served in the Klingon Defense Force in the 23rd century. By 2290, Chang had risen to become the chief-of-staff for the KDF under Chancellor Gorkon.

Following the destruction of Praxis in 2293, Chang conspired with several officers in Starfleet, including Admiral Cartwright and Colonel West, to destabilize any move for peace between the Klingon Empire and the Federation, by planning to assassinate Gorkon and Federation President Ra-ghoratreii. Chang had a Klingon Bird-of-Prey, the IKS Dakronh, fitted with a specially adapted cloaking device that would allow it to fire when cloaked. When the IKS Kronos One departed Qo'noS to rendezvous with the USS Enterprise (NCC-1701-A) and be escorted to Earth, Chang ordered the Dakronh to follow.

Following a dinner aboard the Enterprise, Chang ordered the Dakronh to maneuver underneath the Enterprise and fire two photon torpedoes at the Kronos One, making it appear that the Enterprise had attacked. Two warriors also beamed aboard the Kronos One in Starfleet EVA suits and assassinated Gorkon. When Captain James T. Kirk and Dr. Leonard H. McCoy beamed aboard to see if they could treat Gorkon, Chang had them arrested and took them to Qo'noS to face charges for assassinating the chancellor.

At the trial of Captain Kirk and Dr. McCoy, Chang acted as the prosecuting counsel and successfully had Kirk and McCoy sent to the dilithium mines on Rura Penthe. With Kirk out of the way, Chang and his cohorts began planning the next phase of the operation, by assassinating Ra-ghoratreii at the new peace conference on Khitomer. However, as he was traveling to Khitomer, Kirk and McCoy were able to escape from Rura Penthe and the Enterprise was also on its way to Khitomer along with the USS Excelsior.

Together, the Enterprise and the Excelsior were able to destroy the Drakonh and kill Chang, using probes that were able to detect the bird-of-prey's engine exhaust, and targeted that point. The assassination of Ra-ghoratreii was also prevented by Captain Kirk and his crew. (TOS movie: Star Trek VI: The Undiscovered Country).