Trivia / The Underground

• Development Gag:
  • The Mainframe◊ is based on early concept art of GLaDOS.◊
  • The Paranoia Core is based on a cut personality core from Portal 2.
• Schedule Slip: While the first five episodes were released within a short time of each other in July 2011, the sixth episode wasn't released until late September 2013. And then the series appeared to be cancelled until Episode 7 released in February 2021.
• What Could Have Been:
  • The Greed Core was going to be interviewed, as seen on the series' Facebook page. Also, the Optimism Core was originally called the Fanboy Core, and the Party Escort Bot as shown on the page appears to have the Protocol Core as its head rather than the Paranoia Core.
  • Here are some additional designs for core eyes.
  • Harry101UK made a song for the series called "Seventeen's Lament", a song heavily inspired by "PotatOS' Lament" from Portal 2.