John and Stephen follow Liz into hyperspace, where they manage to rescue her and return her to the lab. Convinced of their story, she agrees to help them investigate the paintings, which seem to induce violence in those around them.

Robert explains to John that his race uses violent energy as a power source. If they stay on Earth, they will die, but the violence needed to power their departure will completely destroy Earth's civilisation.

John is being held prisoner by Robert in the cellar of the antique shop, unable to use his powers. Chris attempts to rescue him but only succeeds in getting himself in trouble with the police.

Stephen and Paul suspect Laird is involved in Douglas' kidnapping and follow him, only to learn the whole incident was set up by the Doomsday Men. Stephen teleports both boys back to the lab where the Tomorrow People try to convince them to help stop McLelland.

John and Stephen find themselves with two mysteries to investigate - the possibility that Stephen's new teacher Elizabeth M'Bondo is a Tomorrow Person and some worryingly accurate paintings of alien planets.

A new peace treaty is about to be signed but the Tomorrow People are worried about the Doomsday Men, an organisation dedicated to the perpetuation of war. Stephen is sent undercover at the same school, as the grandson of the group's leader.

The Damocles is in the hands of the Doomsday Men and the Tomorrow People are powerless to act. Any attempt at intervention and McLelland will throw the dead man's switch and launch nuclear missiles towards the Earth.

John and Stephen rescue Liz from the youths and find out about the second painting. John buys it from a man who turns out to be Robert's grandfather and takes it back to the lab, only to find out it may be a trap.

History has been altered and the Roman Empire now encompasses half the galaxy. The Tomorrow People and their friends must return to the past to put things right, but Gaius is in hot pursuit.

Stephen earns the respect of Douglas and the others and is invited to join the Doomsday Men. Meanwhile, an accident at the Damocles space station leaves an astronaut in danger, so the Tomorrow People decide to intervene.

Stephen is transported to the Hall of the Time Guardians where he meets Zenon, Peter's grandfather. Peter has become lost in the past and his only hope of rescue lies with the Tomorrow People.

John, Liz and Chris plan an attack on the gladiator training school to try and rescue Stephen and Peter, but none of them have realised Gaius' true nature.

John and Stephen both begin having dreams about Peter and realise he is asking for help, but first they must track down a Roman vase that also appears in the dream.

Adolescent Stephen Jameson doesn't know it but he's about to break out, and several other special teenagers, as well as two thugs, hope to find him when or before he does.

Stephen has been abducted from the hospital by Ginge and Lefty, who take him to the mysterious Jedikiah. John, Carol and Kenny attempt to locate him and get him safely back to the lab.

In the Tomorrow lab, Jedikiah lays in wait to catch Tomorrow People like flies in his web of technology.

John, Carol and Stephen recover to find Jedikiah has left, taking Kenny with him. They follow them back to the mansion in order to perform a rescue, only to discover Jedikiah has set a trap for them.

John and Stephen jaunt up to the cyclops' spaceship in an attempt to rescue Kenny, Ginge and Lefty. There they finally meet the cyclops and discover the real reason why he wants telepaths.

Jedikiah is recovered from space by Count Rabowski, who is already holding prisoner Peter, one of the Time Guardians. Jedikiah tricks Peter into transporting them to the 20th century so that he can get his revenge on the Tomorrow People.

Carol and Stephen jaunt to the Tower of London where they encounter Jedikiah, who takes Carol back to Rabowski's spaceship, hoping to use her as leverage with Peter.

Rabowski finally coerces Peter into opening another Time Arch, where Jedikiah sends Rabowski to assault the lab in a prelude to eradicate the existence of Tomorrow People for all time.

TIM jaunts John and Stephen back to the lab where Kenny attempts to revive them. Meanwhile, Jedikiah forces Peter to take them back to the 20th century one last time.

The Tomorrow People investigate a series of natural disasters which are threatening the entire planet. Meanwhile, Ginger and Lefty take a day trip to Clacton and encounter a sinister pier attraction.

Ginger is brainwashed by the mysterious Spidron, who puts him to work in his mine operation. Meanwhile, Stephen and Lefty return to the pier in search of their friend.

John and Carol return to the lab where they find Stephen has been returned safely, but no one has any memory of what has happened. Meanwhile, Steen returns to the pier to continue his investigation into Spidron.