He is Gus' nephew, shown by calling him "Uncle Gus" when you meet him. After introductions are made, Markus helps Mickey activate the Projector Screen to OsTown, then the Screens to Tomorrow City, Ventureland, and Bog Easy. He tells Mickey what each Screen needs to be activated and how much of it is needed, even giving him advice. For example, Markus tells Mickey the locations of the Gears to power the Screen to OsTown, as well as two possible solutions to obtain a Power Spark. Every time Mickey brings Markus the correct number of Power Sparks, the Gremlin happily sets to work.