Future Gohan is in alternated future where Goku dies when Frieza is a robot a Trunks doesn't kills Frieza and King Cold. When in the future Future gohan and trains trunks(without sword and not yet in ssj1) When dr.gero gets to his lair he turns on 17,18 . When future gohan meets the 17,18 he battles them to the death . When gohan rembers everyone of the z fighters deaths. He then goes ssj1 fights 17,18. He loses his left arm and trunks comes and tries to help out as much as he can.Gohan then goes ssj2 when trunks is nearly dead. gohan uses the super kamehameha.