This series is newer and not popular but I have a 3 theories. Theory 1: The last man was not a scientist or one of the soldiers. There is another race. theory 2: the saw robot probe was still moving. Although the other robots were destroyed, the saw was only slightly burned. I think we will see him again in the future. Theory 3 and the biggest: In the first episode, there was an assassin robot with electricity on its back. We saw him talking to the master. However, he started the war and disappeared and was not seen for 7 episodes. I think the assassin robot is one of the master's secret members. We may see titan form or another form in the future.
