Dragon Ball Z Special 2: Zetsubou e no Hankou!! Nokosareta Chousenshi - Gohan to Trunks (Dub)
It has been thirteen years since the Androids began their killing rampage and Son Gohan is the only person fighting back. He takes Bulmas son Trunks as a student and even gives his own life to save Trunkss. Now Trunks must figure out a way to change this apocalyptic future.