One of four survivors from the Splinter attack (in the game from which the manga is based, Metroid Prime 2: Echoes, there are no survivors), Jeff emerged with the other three survivors of the team after Samus killed a Dark Alpha Splinter, and was seen being supported by Lily Thran. Introducing himself to Samus, he informs her that their comm link had been destroyed, and he could not repair it as it was "not his specialty". In the final battle, Jeff is brutally killed by large creatures along with the other survivors.