The Birth: After Jean Grey was thought dead, Cyclops met Madyline Prior, a lookalike for Jean Grey. Cyclops married her, and together, they had a son, Nathan. When Jean Grey was discoved alive, Cyclops left Madyline and Nathan, and Madyline in turn took Nathan.

The Legend: Madyline took care of Nathaniel Summers after Scott left her. But she turned insane when she discovered the truth about herself -that she was a clone of Jean. She tried to track down Mr.Sinister; the crook who cloned her and who had kidnapped Nathan. She also started calling herself the "Goblyn Queen", and tried to let a bunch of goblins and demons invade earth by sacrificing baby Nathan. The X-Men and the newley formed "X-Factor" whupped her, and Scott and Jean raised Nathan as their own.
Apocalypse, realizing that Nathan could be a very poweful mutant, tried to kill him by subjuecting him to the Techno-Organic virus (A robotic virus which slowley assimilates its host into a robot). Cyclops could only save him by sending him 2000 years into the future, into the arms of Mother Askani (an 80 year old Rachel Summers).Not that he knew that, of course.
A few years later, some gun-nut named CABLE started causing all sorts of trouble in Charles Xaviers name. He eventualy mellowed out a little bit, and took over the reigns of leadership of the New Mutants, renaming them X-Force, after Magneto went evil again. Cable dissapered soon after, and re-appeared with a new team calling themselves "Six Pack" including Domino and his son from the future, Tyler.
Then, for no reason, Cable shot Proffesor X. Actualy, it was Stryfe, Cables evil clone. The various X-Teams moved to Xaviers side, and kicked Stryfe's ass. Of course, He then released his LEGACY VIRUS, which claimed the life of Illyiana; sister of Colossus and both he and Cable dissappered...
Cable returned and re-took leadership of X-Force. However, things were amis. Everyone though CABLE was the clone and that STRYFE was actualy Nathan Summers! Idiots. Mr. Sinister then came clean. He revealed that Cable was indeed Scotts son, and that he intended for Cable to be born so he could have an awesomly powerful mutant. However, all the time-jumping and the Techno Organic virus peverted that plan.
Scott and Jean got married, and their honeymoon took them on a 12 year trip 2000 years into the future. Racheal (Mother Askani) had summoned them to raise baby Nathan to fight Apocalypse, beacuse she was old and dying. In new bodies and calling themselves Slym and Redd Dayspring, they raised Nathan as their own. When Nathan was 13, the two mysteriously vanished, going back in thier real bodies in the present.
Somehow, This made the present Cable a little stronger.
Currently, Cable is in Greece, and travels to and from a town called "Hells Kitchen". He is gearing up for another battle between his enemy - Apocalypse.
His powers include a combo of Soctt's and his mother Madelyne Pryorare's powers. Cable is an awesomly powerful telekinetic and telepath. However, the majority of his power is concentrated on keeping his techno-organic infection from spreading.