In the first one its basiclly just Jak and Daxter trying to defeat Gol and Maia,after beating them Jak,Daxter,Samos,and Keria find the Rift Gate(they found them in Jak 1 then Jak 1 ends)Now comes Jak II,Jak and Daxter take the Rift Gate back to Samos Hut and Jak activates it.Then Metal Kor comes out with some Metal Heads and they swarm the village.When they swoop past Kor,the Car thingy they were in blows up and Jak and Daxter get separated from Samos and Keria.Then Erol comes and takes Jak prisoner(they took him because the Baron wanted to use his Dark Warrior project on him)and after 2 long years in there,Daxter finds him and saves him but only finds his best friend to have a dark side.Then Jak does all these missions to get to the Baron,but the Baron gets killed by Metal Kor and then Jak goes to the Metal head nest and fights Kor.After fighting him,he finds out that the little kid with the Mar symbol is HIMSELF(that was obvious if you pay atention).Then Jak III comes.This one is about Jak getting exiled from Haven City for using his Dark Jak form and scaring the people.Jak,Daxter,and that bird(cant remember his name) pass out and are found by Damos,the King of Spargus City(and Jak's father)and some of his warriors.Ashlen comes to Spargus City,hoping to convince Jak to come to Haven City and help them fight off the Krimzon Guard Bots AND the Metal Heads.When she finally convinces him,he taks a Hellcat carrier back to Haven City only to find it in shambles.After a little while,Jak goes to the Krizom Guard Bot factory and finds CYBER-EROL and fights him.After that he heads back to Spargus city and helps them fight off the DarkMakerMachines.Then he and his father go to find the Percursor Catacombs but his father slowly dies and then Veger tells him that he is MAR and then Jak chases after Veger in the Catacombs.Then Erol(Syber)finds darkmakermachines and takes one of them to go destroy Spargus City and Haven City.When Jak finally beats him,he heads back to Haven City and they have a party.Then Jak X comes in this is basiclly about Jak having a virus inside him that Krew put in him in Jak II.He has too race though difficult challenges to get the cure(thats all i know)