General Chang was waiting in orbit with his Bird-of-Prey, however, and the Enterprise was attacked upon arrival. The starship was seriously damaged and suffered a hull breach through her saucer section. The Excelsior, too, was helpless against the cloaked ship. Fortunately, Spock, McCoy, and Uhura devised a plan to use a photon torpedo equipped with sensors capable of tracking ionization from the Bird-of-Prey's impulse engines. It successfully hit Chang's vessel, knocking it out of the cloak and leaving it vulnerable to further torpedo volleys from the Enterprise and the Excelsior. Following the destruction of the Bird-of-Prey, Enterprise and Excelsior crew beamed down to the Khitomer Conference and apprehended the conspirators, preventing the assassination. (Star Trek VI: Rotta verso l'ignoto)