Season 1

Gon and Killua attends audition and they encounter two members of the Phantom Troupe. Kurapica is struggling with fever.

Killua and Gon train individually to develop special techniques in order to prove themselves strong enough to play Greed Island. Killua develops an electricity based Hatsu while Gon develops power combining all the basic Nen abilities to create a Hatsu.

Gon and Killua take and pass Tsezguerra's exam for entering Greed Island. They part with Leorio and travel to Battela's mansion, where they enter the game.

During the game's introduction, Gon finally finds out the contents of the memory card Ging left him. Together Killua and Gon take their first steps into Greed Island. Killua and Gon go to the town of Antokiba and get their first cards. During the game, they see a man whom entered Greed Island with them die from a mysterious explosion.

Gon and Killua are invited to join a player's alliance but decline and go on their own. They win their first card in a "Rock, Paper, Scissors" competition.

Gon and Killua continue playing, but the card they won gets stolen by some more experienced players. Members of the Phantom Troupe start to play the game with their stolen copy.

Gon and Killua head toward the city of Masadora, where spell-cards can be purchased. They meet monsters, bandits, and more. Biscuit Krueger follows them and gets frustrated with their lack of skill.

Gon, Killua and Biscuit are attacked by Binolt, a bounty hunter. The trio subdues Binolt and Biscuit gives him a chance to live, using him to train the boys during a two-week period.