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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
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. According to a line from Cave Johnson cut from the game, Greg once fought a bear.
List of appearances
- Portal 2 commentary