Twin Saviors of the Future

Far into the future, Androids attack. The Z fighters were desperate to stop them but failed. The only remaining Z fighters was Gohan. Gohan grew up alone, having no one, only Training and fighting the Androids. Then he met a girl one day. At age 15 he had no one to tell him what was good and what wasn't. So they ended up sleeping together. 9 months later he had a child. Of course being a young girl at the age of 16 when the child was born she died through the birthing process. Gohan was devastated by this but continued to raise his child. He ended up finding Bulma and her 3 year old son Trunks. He moved in with them and they lived together. Then one day... His son, Kó was 15, trunks was 18. Gohan decided to go out and challenge the Androids one last time. He didn't make it out alive. Now Kó and Trunks are on a mission. Go to the past to stop the Androids and save the Z fighters. But even if they do stop the Androids... Who's to tell an even greater evil won't step up?