In Robots and Aliens, the late science fiction genius Isaac Asimov put forth a challenge to a talented group of science fiction writers: What would happen if the robots of Asimov's universe were to meet alien races? Would the Three Laws of Robotics that protect both humans and robots still apply when dealing with a species that is neither...? INTRUDER Derec Avery has at last returned to the original Robot City, only to discover that it has been reprogrammed in ways that do not make sense. Together with his companion, Ariel, and his father, he must find and defeat the Watchful Eye, the strange force that has bent the city to its own ends. Can the trio solve the new mystery of Robot City before it comes tumbling down around them? ALLIANCE Robot City has been restored, but can it last? Three shape-changing renegade robots threaten to destroy the city, but are they really capable of disobeying the Three Laws? Derec and Ariel must convince the renegades that an alliance, not a robot revolution, is in their best interest - but will they succeed? The futures of mankind and robotkind wait for the answers! This pair of adventures, enhanced with essays by Asimov himself, continue the saga of Robot City, where the finest minds in science fiction enter the most futuristic landscape in robot history!