Piccolo trains the boys in fighting the evil creature Majin Buu, but is later absorbed by Buu along with Gotenks and Gohan and incorporated into his being.

Several years later, Krillin confronts the Saiyan invaders Vegeta and Nappa along with his friends and is one of the few survivors from the fight, aside from Goku and Gohan.

Goku World, Krillin along with Goku, Trunks, Bulma, and Gohan travels back in time to examine event in the past.

Once freed, Trunks, along with Goten, Gohan, and Piccolo were killed when Kid Buu blew up the Earth.

Chi-Chi along with her father, Ox King, and Gohan are attacked by an unknown group of warriors.

Gohan proved this during the battle against Garlic Jr. when he defeated each of Garlic's minions by killing them, when fighting Cell by claiming a murderer like him needed to suffer before being defeated, and during his battle with Buu, whom he heavily and deliberately humiliated when every of his attacks showed no effect against Gohan.

Initially, Gohan is illustrated garbed in a Hanfu-like surcoat with the Chinese character, fixed on the front and the four-star Dragon Ball fitted on top of his hat.

Normally thereafter, Gohan is drawn with a keikogi modeled after Piccolo's own, with the anime recoloring his wristbands from blue to red and, during the Cell Games tournament, his obi from red to blue, despite reverting to the original colors for the former.

On Namek, Gohan is portrayed in battle armor worn by Frieza's henchmen, having been given it by Vegeta in preparation for their encounter with Frieza.

Prior to his second fight with Majin Buu, Gohan asks Kibito for an outfit resembling his father's, and is then drawn in a keikogi identical to Goku's.

His tutelage under Piccolo forms a deep bond between the two characters, with Piccolo ultimately sacrificing himself to save Gohan during their fight with Nappa.

After Garlic Jr. escaped from the Dead Zone and enslaved most of humanity with the Black Water Mist, Gohan, who was unaffected due to hiding in a cave, is forced to travel to the lookout point to save his mother and friends, together with Krillin and Piccolo.

While outmatched at first, after a reunion with his friends Gohan eventually manages to overcome and send Garlic Jr. back to the Dead Zone by blowing up the Makyo Star that was powering the villain.

Gohan then commits himself to training with Goku and Piccolo until the arrival of the androids.

Following Gohan's emergence from the Hyperbolic Time Chamber, Gohan is depicted as a Super Saiyan, with Piccolo shown thinking to himself that he barely recognized him before granting Gohan's request to give him an outfit resembling his own. After Goku surrenders from his match with Cell, he recommends Gohan to be Cell's next opponent.

Gohan matches Cell's powers with his Super Saiyan form but is reluctant to unleash his full power.

After being constantly tormented by Cell, and after seeing Cell killed Android # 16, an enemy-turned-friend, Gohan, infuriated, ascends to Super Saiyan 2, and later defeats Cell in a Kamehameha struggle, counseled by Goku from the afterlife and winning with the assistance of Vegeta.

Piccolo remains amazed with the powers from Goku's son, Gohan, and trains him to fight against the two Saiyans who will invade Earth.

After the Saiyans are defeated, Gohan and others travel to Piccolo's homeworld Namek to revive those who died against the Saiyans with the Namekian Dragon Balls.

He then trains with Goku and Gohan for three years to prepare for a battle against two powerful androids created by the Red Ribbon Army's Dr. Gero to kill Goku.

After the defeat of Vegeta, Gohan, Bulma and Krillin travel to Namek to use the Dragon Balls there, as the Dragon Balls on Earth had turned to stone due to the Earth's guardian Kami's death.

After a few close encounters with Vegeta, Krillin and Gohan are forced to team up with him in order to fight Frieza's strongest warriors, the Ginyu Force.

After Krillin and Gohan collect the seven Dragon Balls, Frieza battles them until Goku appears.

In the Team Four Star parody series, ' DragonBall Z Abridged ', the introduction instrumental plays, when Krillin, Gohan and Dende are taking the DragonBalls while Vegeta is asleep to prevent him from making his wish for immortality.

Goku, Gohan, Krillin, Piccolo, Oolong, Yajirobe and Master Roshi arrive and encounter an army of strange, large, silent robots.

It seems to be set sometime after Vegeta and Nappa were on Earth, but before Bulma, Gohan, and Krillin left for Namek, although Vegeta isn't even discussed in the movie.

In the movie, the Z-Fighters face a new threat that starts with the burning of a forest, in which Gohan and Krillin rescue the forest animals and a small dragon named Icarus.

Cutting to the present day, Goku is shopping with Gohan and Chi-Chi, while Krillin, Master Roshi, Oolong and Future Trunks wait for a beauty pageant.

The humanoids introduce themselves as Androids 14 and 15 as Gohan, Krillin and Trunks join the fray.

Following 13's death, Krillin and Gohan are sent to the hospital.

The movie starts with a big martial arts tournament in which 200 elite fighters will compete, including Yamcha, Tien, Piccolo, Gohan, Future Trunks, and Krillin.

Tien, Piccolo, A 13 year old Gohan, Krillin, and Future Trunks are among the 8 who advance.

Gohan, Krillin, and Future Trunks are among the 4 who advance to the finals, in which each of them will compete against a fighter from elsewhere in the galaxy.

Everyone soon begins to realize that there is something wrong as Trunks is challenged by Kogu, Krillin faces Zangya, and Gohan confronts Bujin.

Gohan continues his fight with Bujin until he is led out to where Krillin and Trunks are.

After Krillin sets up a shelter in a cave with Goku, Gohan flies off to obtain Senzu beans from Korin.

After Krillin and Gohan are beaten down by Salza, Goku appears fully healed.

Goku, drained after his battle, is found by Krillin and Gohan.

Piccolo, startled by this, then takes Gohan away following the fight and Goku's death, and trains him for the upcoming battle against the two other Saiyans, Vegeta and Nappa, though Piccolo is aware that training the son of his greatest enemy will be a risk.

Chris Beveridge from Mania Entertainment praised Piccolo's growth in Dragon Ball Z as one of the most important parts from the series, noting how he decides to train Gohan to fight Vegeta.

Becoming desperate to stop the android threat before he grows out of control, Goku is forced to prepare his ultimate weapon, the Super Spirit Bomb, whilst Vegeta, Piccolo, Gohan and Trunks distract 13.

Vegeta battles him as a Super Saiyan, only to lose and have Gohan transform into a Super Saiyan 2, which kills Bido, Kogu and Bujin.