A teenage assassin trained to be the perfect soldier. He met Snake in the past as a child soldier in Mozambique known as Frank Jaeger. As a teenager, Null became a member of the FOX Unit when it was under the leadership of Gene during the incident at La Peninsula de los Muertos. He confronted Big Boss during the operation, but was unable to defeat him. Despite being laid back into his stasis-tank, his memories of the battle with Big Boss couldn't be erased. He first escaped from the stasis-tank shortly after Ocelot's call to him, killing several officers before finally being subdued quickly by Gene by stabbing his hands and knees with knives and telekinetically pushing Null. Driven by want to kill Big Boss, he broke free of his chamber a second time and after slaughtering many of his own comrades he confronted Boss again, asking "Why won't you die? What do you hope to accomplish by living?". It was only after this second battle that Big Boss realized who Null really was. Big Boss defeated Null again and convinced him to seek help somewhere outside of the FOX Unit.
