Dragon Ball Z: The History of Trunks is a TV special anime based on Akira Toriyama's Dragon Ball manga series. Originally airing in Japan on February 24, 1993, between episodes 175 and 176, the special is based on an extra chapter of the manga series. It depicts the original post-apocalyptic future in which Goku has died from a heart virus and a teenage Trunks, under the tutelage of Goku's son Gohan, tries to defeat the Androids 17 and 18 (native name:人造人間), a pair of biologically-enhanced humans who were originally programmed to murder Goku and his allies and who now continue to terrorize the Earth and the human race.