John, Liz, Stephen and Tyso return to Earth to see if any more Tomorrow People have broken out in their absence.They sense the presence of another telepath, Mike Bell, and decide to leave him to break out in his own time.Unfortunately, his abilities have already brought him to the attention of some criminals.
Lord Dunning takes Mike's family prisoner in order to force him to use his powers in his service. Meanwhile, John, Liz and Stephen attempt to discover his whereabouts by interrogating Slow and Two Tone.
John, Liz and Stephen are able to secure Mike's release but are unable to prosecute Dunning without revealing the Tomorrow People's existence. However, Mike then goes to Dunning and offers him a partnership.
A spaceship is detected near Earth and John and Stephen join aboard to collect the pilot, Kwaan, who has been injured. However, when Mike goes up to the ship on his own it results in several of the Tomorrow People being trapped on board.