Kieran and the Robots
by Alan Wallach
Kieran and Rajilad are visited by massive 7 foot robots, Marty and Willie, from another universe. Their universe is populated only by robots because humans have become extinct. After joining Kieran and his colleagues on a trip to Rikki's past to see a UFO, and after saving Bal's life on the trip, Marty and Willie decide to visit their own past to find out why humans have disappeared.