She was played by Natalie Forbes.
Kristen McCord was a scientist and Ian's former romantic acquaintance. While on a date, Kristen shows Ian an aphrodisiac she had been working on and gives a dose to herself and Ian. It made them amorous for each other, but there was a side effect: it turned them both into wild beasts; complete with fangs, wild eyes, and some hair. Unbeknownst to Ian, Kristen had taken that aphrodisiac before and she had actually killed a man who met her online. After her date with Ian, Kristen was experiencing another transformation, which drove her to worry, because they were happening too fast. She kept her wild side at bay until she got to the parking lot, when she changed again and went after an onlooker. Ian was also still feeling the effects of Kristen's experiment, which led Randi to lock him up in the cage that she uses for her werewolf transformations, while she searches for Kristen.
Randi finds a deranged Kristen laughing maniacally and stating that she is now embracing her monstrous side, right before Kristen attacks Randi and handcuffs her. After subduing Randi, the evil Kristen attempts to seduce Ian, who entered Kristen's place looking for Randi. When Ian rebuffs her advances, Kristen lunges after him. Meanwhile, Randi turned into a werewolf under the full moon and lunged after Kristen. Ian underwent his own change from the aphrodisiac and the three of the fought until they fell out of the window. The fall killed Kristen, and Randi (in her human form) finds her laying dead, and still in her bestial form.