Sentai Mountain (Before being split).jpg|The Sentai Mountain during the Peaceful Era Split Mountain.jpg|The Sentai Mountain being split, beginning the time known as the Split Mountain Era SMbeforebridges.jpg|The Sentai Mountain before the humans built bridges to reconnect the halves The sentai Mountain.jpg|The Sentai Mountain after bridges were built Sentai Mountain (Golden City Era).jpg|The Sentai Mountain during the Golden City Era A long time ago, this mountain was very peaceful, humans and robots worked together in harmony. the robots went out and gathered food and materials for the humans, and in return the humans used some of those materials to repair the damaged robots. But then... something went wrong... the humans found new technology... and used it to build a super robot, called