A Chinese businessman, he was infected by Samaritan with avian flu and live human flu virus to create a super virus. Ko succumbed to the virus and the hospital he was at was quarantined. The Machine was able to create an anti-viral and stop the outbreak but Samaritan still achieved its objective as the fear of the outbreak convinced people to give their DNA willingly to be tested for future outbreaks. Samaritan planned to use this information for what it called the next "Great Filter".
A former associate of Elias, he ran a transportation business. His trucks were being used by Samaritan to deliver explosives for the demolition of a tunnel. Fusco questioned him and learnt that Jeff Blackwell was working as one of his drivers under the alias of Patrick Dodson.
A prisoner at Samaritan's Johannesburg facility where Shaw was being held, he was being beaten up by his cell-mates until Shaw rescued him. He and Shaw went their different ways as he said he still had friends trapped in the facility that he couldn't leave behind. Before leaving Shaw told him to look her up if he was ever in New York.
An epidemiologist at Saint Teresa's hospital, she was working in the ER when James Ko checked himself in. When Ko died after receiving an anti-viral injection she ordered for a blood test. After it was revealed that Ko was infected with a super virus she asked Reese who was there as Detective Riley to help lock down the facility while she treated the patients. She had earlier filed a complaint about errors in the new health care database and as Samaritan was manipulating the entire health care system through the database, it ordered Jeff Blackwell to kill Dr. Mason. However Reese and Fusco intervened to save her life.
The administrator at Saint Teresa's hospital, he was working for Samaritan and helped manipulate the health care database. He destroyed the antivirals which could've slowed down the virus outbreak but was attacked by Bear on Finch's command and later arrested.
One of the nurses working in the ER at Saint Teresa's hospital, she treated the patients alongside Dr. Mason during the virus outbreak. She had also filed a complaint about errors in the new health care database and was thus targeted by Samaritan. Jeff Blackwell stabbed her with a syringe containing James Ko's infected blood and although she didn't die she did suffer permanent kidney damage.
Jeff Blackwell's ex-girlfriend, Jeff met up with her after he started working for Samaritan. He tried to rekindle their relationship but she turned him down saying she couldn't go through all that hardship again.