Aquaman #71

Aquaman journeys to the prehistoric kingdom at the center of the earth to encounter that world's own warrior-king. The two regal powerhouses don't exactly hit it off, but they soon must set aside their differences to contend with an even greater threat!

Characters: Aquaman, Cerdian, Dolphin, Garth, Machiste, Mariah Romanova, Mera, Mongo Ironhand, Travis Morgan, Vulko