After a raid by the ODSTs led by First Lieutenant Melissa McKay, he was assigned to inspect and haul cargo coming on to the crashed vessel for use by the Covenant who occupied it. This was to make sure that Flood did not infiltrate the vessel.
He was placed under the command of Yayap, after the Unggoy arrived at the site following a failed battle at Alpha Base. He did not like the Grunt, criticizing him and calling him a "Gas Sucker". Nevertheless, he complied with the Yayap's orders because he had no choice. He, along with Jak and Bok, tried to make Yayap's life difficult anyway.
After Bok was killed by a group of Flood hiding in a cargo pod, Yeg suddenly became much more respectful of the Grunt. It is unknown what happened to Yeg, though it was very likely he was killed when John-117 detonated the Pillar of Autumn's engines, or during his infiltration. Though it is possible he escaped along with a large number of other Covenant.
- Halo: The Flood (First appearance)