This subject is related to the Portal era.
This subject is related to the Portal 2 era.

Test Subject

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This subject is related to the Portal era.
This subject is related to the Portal 2 era.

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Test Subject
Political information

Test subject


Aperture Science

Societal information

Handheld Portal Device


Advanced Knee Replacement

Historical information
Game information
Voiced by

Mary Kae Irvin (female Citizen sounds are reused when Chell is hurt by physics damage)

"Unbelievable! You, Subject Name Here, must be the pride of Subject Hometown Here."

A Test Subject is a human, animal or robotic individual used by Aperture Science in their computer-aided Enrichment Center.[3] A Test Subject traveling to Pocket Universes is referred to as Test Traveler.[4]

The generic stick figure Bendy[5] is often used to represent Test Subjects, although it can also represent any type of Aperture employee, or real-world players.


Test Subject Chell, Portal's playable character.
  • While most of the time Test Subjects are human individuals, Aperture has been known to use animals (such as chickens), as well as robots (such as ATLAS, P-Body, the Military Androids, among others).
  • Test Subjects are also required to answer essay questions, like Essay Question 1-A: "Why should Aperture Science accept you as a research volunteer and would anyone file a police report if you went missing?"[7]
  • While common scientific / medical research made on humans is never directly dangerous, the ASHPD tests can be very dangerous, and can often result in the death of an unwary Test Subject. The hazards met include vaporization caused by High Energy Pellets, death by bullets from Sentry Turrets, falling in toxic liquid, being burned alive (by falling in an Emergency Intelligence Incinerator, or, in the case of Chell, by being purposefully killed by GLaDOS), being hurt by falling objects such as Weighted Storage Cubes, and being crushed by pistons (only in maintenance areas, if the Test Subject escapes).
  • Human Test Subjects are fitted with Advanced Knee Replacement to slow down their falls, primarily to protect expensive testing equipment rather than the Test Subjects.
  • According to GLaDOS, Aperture Science's annual bring-your-daughter-to-work day "is the perfect time to have [one's daughter] tested", suggesting Test Subjects are (at least partially) chosen among daughters of Aperture employees. Other popular Aperture Science Test Subject gathering methods include paying homeless people insignificant wages, forcing employees to participate in tests, picking up orphans from orphanages or transferring psychiatric patients from Aperture-branded mental institutions.
  • ASHPD tests allowed Aperture Science to discover that Test Subjects, when confronted with science, may exhibit any or all of the following personality flaws: cowardice, impaired motor skills, poor judgement, fear of heights, weights, depths, bullets, and fire.[8]
  • According to Wheatley, the Enrichment Center has held over 10,000 Test Subjects.
The panel on the back of a Relaxation Center room that labels the test subject.
  • Other subjects' Relaxation Center Chambers and a small description about the subject such as their age, body type, gender, and height can be seen in the Aperture Science Extended Relaxation Center. However, it seems most of these test subjects have "expired" according to the label.
  • The Hand-Assisted Non-Verbal Machine Human Communication Training is also used on robotic Test Subjects.[9]

Known Test Subjects[edit]

As of the events of Portal 2, both Wheatley and GLaDOS imply that Chell is the last surviving Test Subject of the 10,000 residents that were stored there before the Enrichment Center was locked down. Shortly before GLaDOS's murder at the hands of Chell, a robotic replacement program was being developed to render Chell and any human-based Test Subjects as unnecessary and irrelevant. However, during the co-op campaign, ATLAS and P-body discover a room full of humans in suspended animation, apparently giving the facility even more subjects to test. Later, in the Art Therapy co-op course, GLaDOS admits that all the humans had died during her failed attempts at turning them into "killing machines".

Test Subject #042's clipboard sheet.
Test Subject #234's clipboard sheet.


Portal 2[edit]

VR tech demos[edit]

  • Unnamed Test Traveler (human) (The Lab)
  • Unnamed Test Subject (robotic) (Moondust)
  • Unnamed Test Subject (robotic) (Aperture Hand Lab)


  • In the Portal series, the playable characters are always Test Subjects.
  • The track "Subject Name Here" in the Portal soundtrack is a reference to the GLaDOS' quote, "Unbelievable! You, [Subject Name Here], must be the pride of [Subject Hometown Here]." said at the completion of Test Chamber 06.



PotatoFoolsDay ARG[edit]

Portal 2: Lab Rat[edit]

Portal 2[edit]

The Lab[edit]

List of appearances[edit]

Main games[edit]



Test Subject
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