An organisation made up of telepathic races. All the telepathic races are unable to wage war, and are sometimes at a disadvantage when dealing with advanced non-telepathic races.

The police force of the Galactic Federation. Their main job is to stop non-telepathic races interfering with worlds where telepathic life has not yet emerged.

The space station where the leaders of the Galactic Federation meet. 

There are no defensive or offensive weapons to protect the station. 

The Proctor Detention Centre is part of the station. 

Artificial intelligences run the station.

A closed world outside the Galactic Federation. The planet contains a large amount mineral resources, including platinum and diamond. Two Gallian years are approximately equal to three and a half Earth years. 
 
It used to have an advanced civilisation approximately 2000 years ago. It is believed that a war over mineral rights lead to the collapse of the civilisation. The local population has reverted to a low level technology and now lives in small settlements near the coast. 

The Gallians had been enslaved by the Kleptons for approximately 3½ years. 

The Tomorrow People had gone to Gallia for a holiday, and to examine some Gallian artifacts for the Planetary Archeology Department. They had setup a base that looked similar to a circus tent, and surrounded by a force field that also hid the base from sight.

A vase from Roman Britain. It depicted a scene from the gladiator school in Silchester. On the lid Peter had added a Neutron Interton Diagram for a primitive Time Disk. The vase was stored at the British Museum and was looked after by Professor Freda Garner. Stephen tricked Professor Garner into giving him the lid of the vase.

A bright green beverage with an alcoholic or narcotic effect.

A school in Scotland. The headmaster is Dr. Laird. The school promotes old fashioned values, making all the boys wear kilts, removing all the glass from the windows in the dormitories and making the boys go on regular cross-country runs. 

The school is also a recruiting ground to the Doomsday Men.

The god of the Regoraans. He endows the leader of the Regoraans, Tirayaan, with special powers that allow him to communicate with other Regoraans, and to heal people from any race. 

The shuttle craft contained a large statue of him. Every Regoraan carries a small statue with them, usually stored in a small pouch on the chest of the tunic. 

His name may be spelt Zitaan.

An organisation from the future that controls the access to time travel. A Time Key is used to open the Time Lanes. Guardians sometimes travel in time to collect historical information. If a Guardian is captured or injured other Guardians are not allowed to attempt a rescue. It is sometimes possible for a Guardian to contact telepaths in a different time via dreams.