Anon, the saga would have been better if Toriyama continued with his actual plan and made Gohan into a scar faced sword swinging warrior and had him fighting armies of invisible ki absorbing androids in the future.
He teaches kid trunks how to fight and that's why he carries a sword. To use against ki absorbing red ribbon cyborgs and robots.
Gohan dies in a fight against his archnemesis General 16 and they androids begin to take over the world.
Trunks mother tries to create a time machine and go back into the past to save Gohan but an accident happens and it sends Trunks back in time to before Goku dies.
He fights Frieza and lays his..her...it's ass to the side(No king cold though he's saved for the saiyaman space saga)
He tells the Z warriors and the newly arrived Goku that he's going to get sick and die and they scramble to help him.
He almost tells him about the red ribbon army but he, being a genius and all, decides to hold his tongue for fear of making the future worse.
The first androids come later and the Z warriors fight them. Goku has a heart attack while fighting and losing badly against newly awakened yet still unfinished General 16.
Bulma puts him into suspended animation while Piccolo leaves the planet to go find a cure.
Because of his tampering in the past a new menace is born. 17 and 18 two powerful androids with limitless energy and greater strength then even 16 are released.
The battle is joined. But there is another terrible project that the Good doctor has been working on. The ultimate power for his reawakened son. The biocell.