Power Girl #19

SURVIVAL OF THE FITTEST! Power Girl, Omen, and Steel are held hostage inside a bubble that's cut them off from the rest of Metropolis and sent them back to the prehistoric age. The villainous trio responsible wishes to eliminate anyone who dares to interfere with nature, and they won't stop until our heroes are extinct. But that's not the only thing Power Girl and her friends have to worry about--the dinosaurs are hungry!