Episode 17 of "Dark Angel"
s01e17 Shorties In Love

When Diamond, an old girlfriend of Original Cindy's mysteriously reappears to rekindle their relationship, Max finds her anonymity dangerously comprised by a stranger with a deadly secret. Max becomes suspicious of Diamond's presence when Max is attacked by strangers. Logan investigates the identity of the attackers. Meanwhile, Max carries out a heist at the request of Logan. Unbeknownst to her, Max is followed on the heist by Diamond. Diamond accidentally trips an alarm and Max is caught. Diamond got away with the goods from the heist and convinces Cindy to leave town with her to start a new life. While Max is in jail, Hazmat-suited soldiers drug her and take her to a laboratory. Max escapes after she learns her captors plan to kill her because she won't reveal the whereabouts of Diamond. With the help of Logan, Max discovers Diamond is wanted because she was injected with a deadly biological poison which was given to her by a genetics corporation. The corporation is trying to cover up the experiment. Diamond becomes sick and is taken to the laboratory. Cindy visits there and becomes trapped. Max springs her, but they leave Diamond behind. She is too far gone and very close to dying. However, before she dies, Max releases Diamond so she can infect her evil captor with her bio-poison by kissing him.