Hematologist who develops the vampire vaccine.
Blade protects Karen while relying on her medical expertise.
Blade takes the bitten Karen to a safe house, protects her from vampire forces, and later rescues her from the ritual site.
Whistler provides emergency care while Karen becomes part of the hunters' operation.
Whistler treats Karen at the safe house after she is bitten by a vampire.
Karen becomes a captive and direct obstacle to Frost's ritual plans.
Frost's forces abduct Karen and place her in a pit at the ritual site to be devoured.
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