The Game Slave is a portable gaming system featured throughout the Invader Zim series. It is a parody of various portable gaming systems of the time, such as the Game Boy. Occasionally, such as in the episodes "Dark Harvest" and "Bestest Friend", the Game Slave is drawn so it resembles a 3 1/2 floppy disk. Gaz can be seen playing a similar, yet unnamed, handheld game system in the Pilot. This device strongly resembles the Game Boy, as it has a cartridge slot and cartridge. The Nanoship's controls resemble the GS1.