The commander of the fleet that investigated the Sorson base set up on the Moon. 

He ignored Mike's pleas to stop fighting near Earth. When his ship was disabled he held Mike captive in a holding beam, believing that the Sorsons would not attack with a Galactic Federation representative on board. When the Sorsons did attack he released Mike before the ship was destroyed.

The leader of the second Thargon fleet sent to remove the Sorsons from the Earth's solar system. 

His original orders were ensure that none of the planets in the solar system could not support Sorson life, or any other life. John and Elizabeth persuaded him that Earth should not be destroyed. He decided to visit Earth to make sure that the Sorsons had left. 

When a Thargon ship was destroyed, he changed his mind and ordered the destruction of the Earth.

A race of advanced non-telepathic humanoids. Their history is similar to Human history with many internal wars. When they developed space travel they stopped their wars and occasionally attacked other races. They have a treaty with the Galactic Federation that stipulates that they must inform the Federation when they enter Federation space. They are an honourable race, they do not have slaves and generally do not attack unless fired upon first. They are unable to use Matter Transporters. They use Thick Ships and Slim Ships to travel, their ships are usually controlled by computers call Thing.

He works for Lord Dunning as his butler at his house on his country estate. 

He was shot in the foot by Lord Dunning to create a distraction when they were trying to re-capture Mike, his mother and sister.

One of 64 clone brothers, they are all telepathic humanoid aliens. Other clone brothers are Ambassador Timus Irnok Mosta and Timon Irnok Manta. 

Tikno was undercover on the planet of Peeri, investigating the activities of the Kulthan.

Tim is an advanced computer based in the Tomorrow People's Lab. He was constructed by John, with help from the Galactic Federation, Timon Irnok Manta constructed key components and provided his voice. He is based on biological components, and can be considered to be alive. He can not be switched off, his external connections can be deactivated, but he still continues to think. 

Tim has some telepathic abilities, he can communicate via telepathy and can create objects from nothing. He controls the jaunting belts and bands, as well as the communication and teleporting equipment used between Earth and the Galactic Federation. 

He can connect to most of the computers in the country, and has access to almost unlimited information. He acts as a father figure to the Tomorrow People, and is very protective of them, he will sometimes rebel against the Galactic Federation to support the Tomorrow People.

One of 64 clone brothers, they are all telepathic humanoid aliens. Other clone brothers are Ambassador Timus Irnok Mosta and Tikno

Timon was responsible for the initiation of Tim, and provided the voice that Tim uses.

All the artificial intelligences within the Galactic Federation have Timon's voice.

Timon is not seen in any of the episodes.

See Ambassador Timus Irnok Mosta.

The ruler of Regoraa. The leadership of Regoraa is passed on from father to son, the next in line is his son Kwaan. 

The ruler is considered divine, and has special powers that allow them to communicate with other Regoraans using the power of the Great Sitaan. 

When he learnt of the rebellion, and that he and his son were to be killed, he programmed the father-ship to enter the hole in space. He hoped that it would stop the rebellion on Regoraa.

A boy from the planet Gallia. He was captured by the Kleptons and forced to work in the mines. 

He managed to escape with Trog, and rescued from the Klepton hunt by the Tomorrow People. He tried to teach John and Elizabeth the local language. He then helped them rescue the other captives.

A boy from the planet Gallia. His father was one of the first people to meet and be killed by the Kleptons. Trog was captured by the Kleptons and forced to work in the mines. 

He managed to escape with Trig, and rescued from the Klepton hunt by the Tomorrow People. He then helped them rescue the other captives.

A debt collector working for Lord Dunning. He mainly collects unpaid gambling debts with Slow. He usually dresses in white and black clothes. 

When he discovers Mike's ability to open locks he persuades him to help him to break into the National Victoria Bank. Mike manages to lock Two Tone and Slow in the vault.

A telepath that worked for the British military. She has developed advanced mind reading abilities, able to read the minds of Saps, but did not break-out because her work for the military suppressed it. 

She worked for Colonel Masters, and was based at the Experimental Weapons Establishment. 

When Jedikiah had captured the Lab, she broke-out and jaunted to the Lab. She managed to turn Tim's power-on long enough for him to contact Ambassador Timus. She went with the Tomorrow People to the Galactic Federation when they were evacuated from Earth. 

When the other Tomorrow People returned to Earth she remained with the Federation, and joined the training programme for the Galactic Police.

He is a Gypsy, and lives with him parents in a caravan. They move to various sites around the country. Professor Cawston discovered that Tyso was telepathic after carrying out some tests, but he was kidnapped by Colonel Masters before the Tomorrow People could help him break-out. 

His full name is Tyso Boswell. We never see his father, but we are told that he does not like Tyso. His mother tries to protect him. He also has a sister, Evergreen.