In the 2150s, the Cybermen invaded Agora and turned it into one of their breeding colonies. After placing human Overseers in charge of conception quotas, they would return every three years to select the five hundred healthiest males for cyber-conversion. In 2175, a rebellion led by Arthur Lakesmith defeated the Overseers, but was swiftly defeated by the Cybermen when they returned the following year. In 2178, six-year-old Grant Markham and three other children were placed on a ship the colonists found on Agora and sent to New Earth. (PROSE: Killing Ground)