The young bionic amnesiac known as Number 13 searches for answers and his creator, in a future world that’s been brought to its knees by the vicious Monstrum Morbus plague. Weakened by his last explosive encounter, Number 13 is discovered by a group of curious, scavenging mutants who have banded together for survival. They dub him “Thirteen” and invite him to join their group—and one of them knows exactly what horrible purpose he was built for!