Marx appears in Chapter 13 to compete in the singing competition. He is also set to appear in the season finale as a tritagonist and one of the tertiary antagonists.
Marx made his first appearance in Chapter 4 selling TVs in a store. Kirby was forced to give him $399.99. Marx also appears in Chapter 5, the first hour-long episode, making a huge rule in order to summon NOVA with the gold trophy made out of some pieces of NOVA. He is also found in most stores.