Algolis

Algolis was a human colony in the Algol system. It housed a relatively small civilian population, and was home to a variety of the Office of Naval Intelligence's research and development projects for prototype weapons, including the HRUNTING/YGGDRASIL Mark I Prototype Armor Defense System. 7

The UNSC Office of Naval Intelligence Section III had facilities on the planet, to which several SPARTAN-II augmentation chemical precursors were sent in without Dr. Halsey's consent, likely in order to be researched for Project CHRYSANTHEMUM.

The colony was attacked by a xenophobic religious autocracy known as the Covenant sometime between 2535 and 2552, particularly due to their interest in the weapons programs on the planet. During the battle, the planet's civilians were evacuated while Marines from the UNSC Corps of Engineers made a last stand against Covenant forces. The UNSC destroyer was en route to the planet to secure prototype weapons from Weapons Research Facility T12A before it was attacked. All Covenant forces perished in the attack.

Algolis' ultimate fate is unknown, as it was not glassed during the battle. However, assuming that the entire human presence evacuated in the aftermath of the battle, the planet may have been spared from total destruction.

List of appearances

 * Halo: Evolutions - Essential Tales of the Halo Universe
 * Midnight in the Heart of Midlothian
 * Halo Legends
 * Prototype