A planet enslaved by the Kulthan. Before the Kulthan invaded telepathic abilities were beginning to develop. These were suppressed by Psi Damping Transmitter installed by the Kulthan. 

Peeri is very Earth like, the gravity and atmosphere can support Human life. The most notable difference is the yellow colour of the sky, this appears to give everything a yellow hue.

The SIS developed a method of delivering Synaptrol using a photonic beam. The technique is similar to that used by the Tomorrow People's Stun Gun.

A type of engine used by some interplanetary spaceships, for example Hiter Taxis. The drive can be rigged to produce a Photonic explosion.

A very powerful explosion that can be used to spread a contaminant, for example Barlumin, across the whole galaxy. A photonic explosion can be created by a bomb or by rigging a Photonic Drive to explode.

A planet that has a detention centre on it.

A large aquatic creature. It is possible that the Loch Ness Monster is a Placadron.

Part of the Galactic Trig. The department examines archeological finds on different planets both inside and outside the Galactic Federation. 

When the Tomorrow People visited Gallia they were examined some relics, and produced a report on the civilisation that used to inhabit the planet.

A region of space near the Earth' solar system. The Regoraan father-ship encountered the hole in space in this region.

A Galactic Federation detention centre on the Galactic Trig. The detainees are held in cells, the front of the cell is formed by a force field. 

John was held there when he was pronounced in contempt when he became angry during a committee meeting discussing the Sorson landing on Earth. 

To ensure that the detainee can not leave, their telepathic abilities can be removed.

Equipment developed by the Kulthan. It emits specific radiation into a planets magnetic field which prevent telepathic abilities operating. They are usually located in pyramids, also built by the Kulthan.

An alternative name for telepathic abilities.