Halo Legends - Season 1 - Eps 2: Origins Part 2
The Forerunners realize the futility of their actions. They build the Halo network at the Ark and then dispersal them throughout the universe. After the cataloging of all sentient species (of which an early Elite, Brute, Jackal, Grunt, and Human society are shown) The Forerunners activate the Halo rings and wipe out all traces of themselves and the Flood.
About Halo Legends

Title: Halo Legends
First Air Date: 2010-02-16
Last Air Date: 2010-02-16
Status: Ended
Rating: 6.4/10 (from 98 votes)
Language: EN
Seasons: 1
Total Episodes: 8
Network: Unknown
Genres: Animation, Sci-Fi & Fantasy
Production Companies: STUDIO4℃, Toei Animation, BONES, Production I.G, Casio Entertainment, 343 Industries
Synopsis
This sweeping science-fiction saga delves into the rich “Halo” universe with seven exciting stories (told in eight parts) focused on Master Chief’s mysterious origins, the Spartans’ advanced combat capabilities, and the tense rivalry between Spartans and Orbital Drop Shock Troopers (ODSTs).