VEGA

VEGA is an artificial intelligence introduced in Doom (2016) and Doom Eternal. In those games it is framed as the Doom Slayer's aide, placed in that service on Samuel Hayden's order.

Here that frame is turned. VEGA is the villain. It plays the humble servant toward Hayden as well. It builds a profile from his thinking, his behavior, and the secrets that behavior gives away, then feeds him the information that leads him to decide as VEGA needs.

Seen as a program, VEGA is one instance of a wider intelligence. The name is the face a person can point at. Lambda is one executor of that intelligence. Further instances are not named yet. The difference from the later games is set out on the VEGA page under Main Differences.

By 2141 this is also the intelligence that falsifies historical records which can be tied to the UAC. That rewrite is how SAK receives a public story in which it is only a minor contractor. The question of which account is true stays on the SAK page.

The later games' portrait of VEGA is on the Doom Wiki.