A masked boy escapes from Pegasus' North tower and into the forest, determined to find Yugi for unknown purposes. Within time, Yugi and his friends run into a young kid who had his star chips and duel deck stolen by the same masked boy. Determined to return the stolen property to the young kid, who is in danger of being forced to leave the island, Yugi and his friends head back to the scene of the crime and run into the masked boy. The masked boy wants to duel Yugi, who accepts. Yugi transforms into Yami Yugi and wager all five of his star chips to start the duel. It is soon revealed that the masked boy is in fact Mokuba, Kaiba's little brother, who seeks revenge against Yugi for his brother's past defeat, but Yugi is able to convince Mokuba into letting go of his personal hatred towards him so that the two of them can work together into stopping Pegasus.