Transformation and exchange are two of the most thematically interesting ways to explore gender and relationships in fiction. This isn’t a new idea, with the story of Tiresias providing an example from Greek antiquity. Such stories can range from ignorant and banal to nuanced and powerful. As a trans woman, I have long held a fascination with them, and they ultimately helped me come to understand what I wanted from my body and my life. “Striking Vipers,” the first episode of season 5 of Black Mirror, is neither of these, instead being a tragic, wasteful misfire that perhaps handles some of its other themes better than this one.