Jareb was a Triannon and a member of a religious zealot group led by Pri'Nam D'Jamat.

In 2153, Jareb participated in D'Jamat's takeover of the Enterprise NX-01 for use against their opponents in a religious civil war. He took over the science station when T'Pol refused to target an opposing Triannon vessel.

After Doctor Phlox neutralized the organic explosives implanted in D'Jamat's followers, Jareb was incapacitated in the firefight as MACOs stormed the bridge. (ENT: "Chosen Realm")