The Underground

The Underground is a Machinima series that is featured on YouTube. In it, there is a core called the Interview Core who started a talk-show where "the rejected are respected and the best-case has no place." It takes place in two forgotten locations within Aperture Science. Currently, there are 5 released episodes, and features a cast consisting of new cores, a turret band, the Mainframe and the Party Escort Bot.

Interview Core
The Interview Core is a corrupted personality core who appears in all episodes of the series. He escaped incineration by GLaDOS and somehow found himself on a table, setting the literal stage for the talk-show. As the host of The Underground, the Interview Core is responsible for interviewing his guests and giving answers to his (possibly empty) audience.

Paranoia Core
The Paranoia Core is a corrupted personality core who appears in the first episode of the series. She is suspicious of all things, and speaks like the stereotypical conspiracy theorist, saying that it knows of "secret walls [being built] in the dead of night in secret to house all the secret boxes that contain files of all the secret rooms where all the real secrets are being kept."



Protocol Core
The Protocol Core is a corrupted personality core who appears in the second episode of the series. He is very knowledgeable about all Enrichment Center policies and was "hand"-picked by GLaDOS to enforce "all of her wonderful regulations." The Protocol Core is under the idea that it was created to be perfect, and as such, denies being corrupted despite being in placed into an Emergency Intelligence Incinerator prior to the episode.



Ambition Core
The Ambition Core is a corrupted personality core who appears in the fourth episode of the series.