Gotham City Sirens: Union

A one-shot from 2010, this DC special by Paul Dini and Guillem March brings together Catwoman, Poison Ivy, and Harley Quinn for a tense alliance. The story finds the three women united by a shared threat, testing the bonds of their uneasy friendship in Gotham's criminal underworld. It's a concise, character-focused glimpse into the dynamic between these iconic antiheroes during their early team-up era.