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Merging and redirecting this article into List of minor Aperture Science employees and related people may be desirable. (Discuss)

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Biographical information


Physical description




Chronological and political information

Aperture Science

Greg is a scientist in Portal 2 whose muffled voice may be heard during the Perpetual Testing Initiative.

PeTI DLC[edit]

In the Portal 2 Perpetual Testing Initiative DLC, Greg can be heard acting as an assistant to Cave Johnson. He is voiced only through unintelligible mumbles in the background.

Behind the scenes[edit]

Greg was originally intended to be in the main game. When the developers realized that they would need a character to play off of Cave Johnson during his recordings, they created a scientist character named Greg. However, they found it a waste of money to hire a new voice actor for only a couple of lines. They instead economized by cutting Greg and adding Caroline. This allowed them to use Ellen McLain as a voice actor and provided an origin story for GLaDOS.[1] According to a line from Cave Johnson cut from the game, Greg once fought a bear.

List of appearances[edit]


  1. Portal 2 commentary