Majin Buu Saga
Buu has been resurrected and is on a rampage of what he thinks is fun. Eventually Buu separates and gets eaten and transforms several times. Every one fights Buu eventually. Gohan reaches a new level of strength (Mystic Gohan), but still can't kill Buu. Gokou becomes a SSJ3 and the fight rages on for a while Vegeta comes back from the dead and fuses with Gokou to make Vegeto. They are permanently fused, but when Buu eats them, being in his body makes them separate. Gotenks is formed by Goten and Trunks and also becomes a SSJ3. He too fails. Gokou in the end makes a spirit bomb with the help of the rest of the people on earth. At first people ignore Gokou, but when Mr. Satan chimes in and tells every one to help they believe him and help Gokou. Buu is defeated and life returns too normal. Buu and Mr. Satan become friends and make an agreement for fighting in the world tournament. Buu gets all the way to the last fight and lets Mr. Satan beat him. Years pass, Gohan and Videl get married and have Pan, Gokou and Vegeta continue to train for the tournament. Gokou asks Buu to make it that he ends up fighting a kid named Ubuu. Gokou believes that he is the good reincarnation of Buu. Gokou fights him and realizes he is right and flies off with Ubuu to train him. Gokou visits his family in-between Training with Ubuu.