To strike back at his "master", Frax releases one of the most dangerous X-Vault mutants, Venomark, who proceeds to infect the city and four of the Rangers with the same poisonous bite he gave Ransik many years ago. Wes finds salvation in the form of Ransik's serum, but can he make peace with his father in an effort to have more of it made? Meanwhile, Frax finally confronts Ransik with the startling truth behind the supposed robot's creation!