Birds of Prey
Slick
S1 E2:
Harley hires Slick (Silas Weir Mitchell), an evil metahuman who can turn from solid to liquid, to kill the honest cops who thwart her evil schemes. When Reese becomes the next intended victim, Helena protects him, and their mutual attraction continues to grow. Meanwhile, Barbara believes Dinah's claim of being a runaway, but Helena remains suspicious.
Starring
Silas Weir Mitchell