Harley Quinn & the Gotham City Sirens Omnibus #[nn]

In "Union," Catwoman and Harley Quinn venture into the overgrown ruins of Robinson Park, where alien flora has taken root and a mysterious plant entity has drawn Poison Ivy into a dangerous alliance. With the fate of Earth hanging in the balance, the trio must confront an otherworldly force whose plans for planetary conquest could reshape the world — or destroy it entirely. Written by Tony Bedard and illustrated by Andres Guinaldo, with colors by JD Smith and inks by Lorenzo Ruggiero, this story features a striking cover by Guillem March.