At KS2-3 there is plenty of scope for examining the genre. Look at writers such as Ray Bradbury (www.raybradbury.com) and Isaac Asimov (www.asimovonline.com). Bradbury's stories engage the imagination - domestic appliances and agricultural machines revolt against humans and robotised houses survive their inhabitants. Asimov is dry, intellectual, but lays down the ground rules for the genre. See The Three Laws of Robotics.
As a stimulus for creative work, don't forget Douglas Trumbull's film Silent Running.