Unused content

Much like any video game, the Portal series contains a large amount of unused content that was cut from development due to a series of reasons either given or disclosed. Below is a list of characters and other unique mechanics that were unfortunate enough to be put on the chopping block.

Characters

 * Mel - One of two playable human test subjects during development on the co-op campaign.
 * Greg - A scientist that helps play prerecorded audio messages from and for Aperture CEO Cave Johnson.
 * Betty - A small robot who, prior to testing, would absolve Aperture Science of liabilities.