Dragon Ball Z Special 2: Zetsubou e no Hankou!! Nokosareta Chousenshi – Gohan to Trunks (Dub) 7.72

Other Name: Dragon Ball Z Special 2: Zetsubou e no Hankou!! Nokosareta Chousenshi - Gohan to Trunks, Dragon Ball Z Special 2: The History of Trunks, Dragon Ball Z: Resist Despair!! The Surviving Fighters - Gohan and Trunks, ドラゴンボールＺ・絶望への反抗！！残された超戦士・悟飯とトランク

Summary: It has been thirteen years since the Androids began their killing rampage and Son Gohan is the only person fighting back. He takes Bulma's son Trunks as a student and even gives his own life to save Trunks's. Now Trunks must figure out a way to change this apocalyptic future.