sentences:  The Security Forces then retreat to the Command Centre, and withdraw to Robotron to regroup, taking Charlie (whose parents were the only family he had, and thus has nothing to stay on Earth for) with them.Cy-Kill swears to build an army and invade the planet himself.The serial was obviously curtailed before Tully had intended, as the ending, with Cy-Kill, Casmodon and Zod unopposed on Earth and the Security Forces in retreat, is highly unusual.