Planet of the Apes/Green Lantern #1

BOOM! Studios and DC are proud to bring together two classic properties in an unprecedented crossover event. When the Forbidden Zone is thrown into chaos, Cornelius investigates and discovers an ancient ring, unlike anything the universe has ever seen. As its power echoes through the stars, the Guardians must reveal to their Lanterns a secret they had hoped would remain buried. With the Green Lantern Corps, led by Hal Jordan, racing to get to the source of this power before Sinestro can get his hands on it, they will discover a truth that will change them forever on…The Planet of the Apes.