Birds of Prey

Season 1, Episode 2: Slick

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Slick, an evil meta-human who can turn from solid to liquid, is hired by Dr. Quinzel to kill the honest cops who stand in her way. When Reese is the next intended victim, Helena comes to his aid and their mutual attraction continues to grow. Meanwhile, Barbara believes Dinah's story that she's just a runaway, but Helena remains suspicious.