"Dark Dragon" (ダークドラゴン Dāku Doragon) is the twenty-eighth chapter of Dragon Ball Heroes: Victory Mission.
Beat continues to train with Sora in the "White Room", while in the Battlefield, the other Heroes come to realize that with the time-space transporter offline, a knockout in the game should have mortal consequences outside it. Broly didn't deliver a knockout, he merely put them out of it. Which means… they were deliberately spared? Genome appears before the others, but before they can try to free him from the Evil Dragons' control, he reveals that he is not under the control of anyone: in fact, he is the one in control. He tells them to get ready for a fantastic show: he had intended to leave them alive, but now the circumstances have changed, and he needs to kill them in order to obtain the One-Star Ball. However, Kagyu reveals that Genome is missing one more: the Four-Star Ball! Back when Broly suddenly appeared, Kagyu helped save the Dragon's life, and as a token of gratitude, it handed over the Dragon Ball. In Kagyu's hand, the Dragon Ball transforms into a card, which reveals the Four-Star Dragon himself! Both the Dragon that was defeated by Broly, and the Dragon Ball Broly obtained, were fakes. At Kagyu's signal, they prepare a new Card Action Ability: "Dark Dragon"! A huge energy blast hurtles towards Genome, who was obviously not expecting this turn of events.