Superman #21 Cover D Chris Samnee Card Stock Variant

Following Doomsday's fiery attack on Metropolis, Clark and Lois realize they have been so busy saving the world that they haven't had time together, so they plan an epic date night! What could go wrong? Well, for starters, a massive alien armada is bearing down on Earth looking for revenge against...SUPERMAN?! What secret has Clark not told Lois about the future?