This is the character page for the BETA, the main enemy faction in the Muv-Luv Alternative setting, including spin-offs.
Spoilers ahead.
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The BETA in general
The BETA (Beings of Extra-Terrestrial Origin and Adversaries of the Human Race., are the main enemies in Muv-Luv Alternative and subsequent spin-offs. They were first spotted on Mars by a probe in 1958.