After Gokou dies, Gohan is taken away by Piccolo (re-incarnation of Piccolo Daimaou), and trained to be prepared for the battle against Vejita and Nappa. Sometime after the first episode, Gohan was put in the first Dragonball Z movie, "Return My Gohan!", or "Dead Zone", and fights Gariku Jyuniya.
After letting Vejita go, and fully recovered, they (Gohan, Buruma, and Kuririn) decide that they have to go to the planet Namek (the home-planet of Piccolo) to get the Namekian Dragonballs, (since Piccolo sacraficed his life for Gohan in the fight against Nappa, and when Piccolo died, the Dragonballs disappeared from the Earth) to wish everyone that died in the battle to come back to life. After landing on a fake Namek, and helping a ship, they land on the real Namek.
They find out that it is being invaded by Freeza (in search for the Dragonballs), and Vegita, also fully heald, is too searching for the Dragonballs. Vegita, Gohan, and Kuririn fight Freeza's Ginyu Tokusentai (Force). After Gokou comes back to beat the crap out of the Ginyu Force, they go up against Freeza. Gokou tells Gohan to leave the fight because he thinks it is too dangerous for him. After Namek explodes, and Gokou arrives back from the planet Kasanna.
The mysterious youth, Trunks, arrives in a time machine. He tells everyone about the artifical humans, that arrive three years later. Gohan trains with Gokou in the Room of Spirit and Time, and learns how to become a Super Saiya-jin. When the real challenge comes, Cell, he is stronger and angrier. With the death of Andriod #16, Gohan gets super-pissed, and turns Super Saiya-jin 2.
Gohan is able to defeat Cell, but he makes the choice that he wants Cell to suffer. Eventually, it comes to the point where Gokou chooses to self-destruct with Cell, on Kaiou Samma's planet. Although, a small piece of Cell survived, and regenerates, and kills Mirai Trunks. Vejita goes balistic, and fights to his fullest. Gohan blames himself for Gokou's death, and decides to kill Cell. Cell blows one of Gohan's arms out, and Gohan blasts a Kamehameha. While their beams are competing, Vegita distracts Cell, and with Gokou's help, Gohan's Kamehameha defeats Cell.
After that, Gohan grows up, and starts going to high school. He creates his superhero form, The Great Saiyaman! Then, at Orange Star High School (the one he goes to), he meets his future wife, Videl. Gohan enters the 25th Tenkaichi Budoukai (he is forced to by Videl), and ends up getting energy sucked from him. He is badly injured when during the fight against Dabura, Babidi, and Majin Buu, and is brought back to Kaioshin's planet. He is healed there by Kibit, and Gohan then enters training with Kaioushin and Gokou. He pulls out the zed sword and masters it in one day. They try it out and to everyone's surprise, it breaks.
So the Kaioshin of Fifteen Generations is realeased. Gohan waits five long hours as a ceramony and a twenty hour power up, and goes after Buu. Gohan dominates for a while, but then Buu absorbs Super Saiyajin 3 Gotenks, and Piccolo. Gohan too, is also absorbed by Buu, but is saved and released by Vegitto. In the begining of GT, Gohan is a scholar, just like his mother's dream. He marries Videl and has a daughter named Pan.
