Eileen wouldn't learn about Lucard's dark secret until "Damsel in Distress," where she is having a dinner meeting with Lucard at his castle. Chris and Max, along with their uncle, famed vampire hunter Gustav Helsing, attempt to warn Eileen, but Gustav is captured, leaving the boys on their own. They arrive at the castle to warn Eileen when Lucard suddenly appears. The boys wielded their crosses at Lucard, but at that moment, Eileen turned heel and revealed herself as a vampiress, showing her fangs and hissing at the boys while knocking the crosses from their possession. After Chris and Max escape, Eileen laughed evilly and danced with Lucard.
Later in the episode, the evil Eileen taunted Gustav down in a dungeon where Lucard held him captive, stating that she loved being a vampire and she adores Lucard. Lucard and Eileen are confronted by the boys, Gustav, and Sophie at the climax, where Lucard orders Eileen to turn Max. However, Eileen's motherly love for Max overcomes her villainous persona, and she hugs her son before fainting and later being freed from the vampire curse.
- Lynne Cormack also played villainess Leslie Kent on Friday the 13th: The Series, as well as the evil Mrs. Dark on Goosebumps.