Participating in a play is one of integral curriculum for young children at nurseries and kindergartens. At the same time, it is not very easy to successfully run and manage a play for young children due to their low age and immaturity. Scripts are difficult to memorize and children's attention span is quite short. We are exploring the use of a robot and augmented reality (AR) technology to assist the nursery teachers in hopes to alleviate the difficult and complicated task of running the play, and also as a way to increase the learning effect by promoting the concentration and immersion (by the presence of the robot and novelty of the augmented display) [1, 2, 3]. For this purpose, we have devised a semi-autonomous remote-controlled projector robot with the capabilities of background projection and control, generating the synthesized augmented view, camera/movement control, producing story narration and various special effects. We have recently deployed the robot assistant for a play ('Three Little Pigs') at an actual nursery to observe and investigate various aspects of human robot interaction. For instance, the robot interacts with the actors on stage, leading and guiding them by showing (with small display on the robot) the synthesized augmented view, script guidance, and putting forth and changing the backdrop projection. It also assumes the role of the camera man and may instigate minute interplay with the actor as it zooms in and out on actors (by remote control). Our initial observation indicated that the use of the robot and AR indeed exhibited very high potential in drawing the attention of the children and enhancing the educational effect, but required the right amount of autonomy and external control and an intuitive interface.