- "Your mother."
- ―Cartridge Unit ("snappy response" cartridge)[source]
Cartridge Unit was a robot who lived in a community of outdated robots who refused to upgrade to newer technology. This community preferred to live a simpler existence on a little island, free of technology. The speech of Cartridge Unit is merely a playback of selected cassettes, although the selection is always made by Cartridge Unit itself. Although it is unknown how many cartridges Cartridge Unit owned exactly, he appeared to have a cartridge for speech applying to every possible situation.
It is possible that Cartridge Unit never actually existed, as his only appearance is in Bender's vision as a result of the Robot 1-X compatibility upgrade. However, he appeared on the Wheel of Robots.