From Halopedia, the Halo wiki
Battle of Line Installation 1-4
In 2552, he was a part of the crew of the CAS-class assault carrier Clarity of Faith. The ship crash-landed on a moon while on a routine mission to rendezvous with a supply convoy. After being snatched from the turret of a Wraith by a Forerunner Gatherer, he was placed in a cell within Line Installation 1-4 along with Margaret-053, Reff 'Talamee, and a single Mgalekgolo. The Forerunner monitor, 686 Ebullient Prism, dissected Jubub along with the Lekgolo colony in hope of finding a resistance to the Flood.
In Halo 3, Grunts may occasionally yell "You killed Jubjub!" This may have inspired Jubub's name.
List of appearances