General Chang was a Klingon officer and chief of staff to Gorkon, Chancellor of the Klingon High Council in 2293. In that year, Chang was involved in the conspiracy to sabotage peace talks between the Klingon Empire and the United Federation of Planets.
Chang was extremely fond of Shakespeare, and often quoted lines from his various plays. Chancellor Gorkon rakishly presumes one has to enjoy Hamlet in the original Klingon, a possible hint why Chang repeatedly utilizes Shakespearean quotes.
In an attempt to frame Captain James T. Kirk for the assassination of Chancellor Gorkon, Chang commanded an experimental Klingon Bird-of-Prey which had the unique ability to fire its weapons while under cloak. Chang's ship fired on Kronos One while it was under escort by the USS Enterprise, making it appear as if the latter ship had fired upon the Klingons, violating the terms of the truce. This attack facilitated the boarding of Kronos One by co-conspirators from the Enterprise, who assassinated Gorkon. When Captain Kirk and Doctor McCoy boarded Kronos One to provide assistance and prevent a full-scale conflict from developing, Chang ordered them arrested and charged with Gorkon's assassination under the rules of Interstellar Law. He also served as the prosecutor for the state at Kirk and McCoy's trial, where he was successful in obtaining a conviction by forcing Kirk to admit that, as captain, he was responsible for the conduct of the crew under his command.
However, Chang was surprised that, due to the impending peace talks, the judge did not order the customary death sentence, but instead sent the pair to Rura Penthe. In an attempt to ensure Kirk and McCoy's death, Chang had the commandant arrange for the Starfleet officers to be killed while attempting to escape, therefore eliminating any suspicion as to the motive for the killings. Kirk and McCoy were ultimately rescued, however, by the Enterprise crew.
With time running out before the Khitomer Conference, Chang ordered his Bird-of-Prey to intercept and attack the Enterprise in orbit of Khitomer. His ship initially had the advantage in being able to fire while cloaked, causing considerable damage to the Enterprise and also scoring a hit on USS Excelsior, under the command of Hikaru Sulu, which had arrived to divert fire away from the crippled Enterprise. However, this advantage was eventually negated when Enterprise crewmember Captain Spock developed a means whereby a photon torpedo could be modified to hone in on the plasma exhaust of Chang's ship. Chang and the other bridge officers were killed by the initial explosion of the modified torpedo, which allowed Enterprise and Excelsior to launch more torpedoes that destroyed the Bird-of-Prey. Reflecting his love of Shakespeare, his last words were "to be, or not to be", from Act 3:I of Hamlet.