In Batwoman Ep. 20: O, Mouse! one of Gotham’s former heroes returns to his old stomping grounds to settle a score, both Batwoman (Ruby Rose) and Commander Kane (Dougray Scott) find themselves on the defensive. Meanwhile, Alice (Rachel Skarsten) has uncovered what could finally take down Batwoman, but she is losing hold on her henchman Mouse (guest star Sam Littlefield) and Hush (guest star Gabriel Mann), sending her spiraling into her most wicked self. Luke (Camrus Johnson) immediately focuses on finding a way to protect Batwoman from Alice, and Mary (Nicole Kang) has a chance to be the sister Kate has needed all along. New information surfaces, forcing Julia (guest star Christina Wolfe) to warn Sophie (Meagan Tandy) about the person pulling the strings. And in a final standoff, when Commander Kane refuses to retreat from his war on Batwoman, Kate may find herself more than heartbroken by her father’s choices. Amanda Tapping directed the episode written by Holly Henderson and Don Whitehead.