Kotaku: The answering machine goes off. It's Ellie, trying to get a hold of Isaac Clarke. He doesn't answer. He's standing in a disheveled apartment located on a lunar colony, but it's not your typical bachelor pad type mess. It's dark, it's grimy, it's gross—it looks as if this is a cave, a personal hell which he has retreated to perhaps. As you muse over this, sergeant John Carver—the character your co-op buddies will play—bursts into your apartment, demanding to know if in fact you are the famous Isaac Clarke.