The sacred drum owned by the religious group The Hearts of Sogguth. They believed that the drum could be used to free Lord Sogguth. 

The drum possessed special powers. It had the ability to control people. The normal level of control could be broken if it tried to make a Tomorrow Person kill. It is possible that a higher level of control would overcome this.

A religious group based on an ancient religion more than 7000 years old. The Hearts of Sogguth was re-established in 1967 by Professor James Marsden, also known as Jake. They obtained possession of the sacred Heart of Sogguth drum. Their ceremonies appear satanic based, but the initiation ceremony include rituals similar to the Free Masons. 

They believed that the Heart of Sogguth drum possessed magic powers. Lord Sogguth could be released from his prison at the centre of the Earth if a thousand thousand people could hear the beat of his heart, the Heart of Sogguth drum. 

John went under cover and joined the group to try to find out what their plans were.

A small spaceship capable of interplanetary travel. The main propulsion system is a Photonic Drive, it also has a set of planetary landing engines. The ship also has a short range Matter Transporter and an escape pod that has enough space and supplies for two people.

A Thargon weapon that can remove some the telepathic abilities from a telepath. It can prevent a telepath teleporting, but allows them to contact other telepaths telepathically. It probably includes a force field to stop the telepath leaving the area of the beam. 

The Thargon Commander used a holding beam to stop Mike leaving the Thargon ship when it had been disabled in a battle with the Sorsons. Mike was still able to contact John telepathically.

Located in the Pluto 5 region of space, near Earth. Sensors are unable the penetrate the phenomenon, but register it as a hole in the fabric of space. 

A Regoraan father-ship was being pulled towards the hole. When the shuttle craft entered the hole it entered a different universe. It affected the power reactor on the shuttle craft disabling the engines. It also affected the passage of time. The shuttle craft travelled in a straight line, but after several hours it encountered the same hole and returned to our universe, but only a few minutes had elapsed.

An alternative name for Homo Superior.

Human beings that are non-telepathic. Homo Sapiens are being replaced by Homo Superior.

The next step in evolution of Homo Sapiens. Homo Superior have telepathic abilities and are also unable to kill, even to save themselves.

An area of space in another dimension. When teleporting the telepath disappears from the departure point, spends a few moments in Hyperspace, and then reappears at the destination point. 

It is possible for a telepath to be stranded in Hyperspace, sometimes it happens if they are breaking-out and teleport before they have learnt how to control it. This is very dangerous as any object or being in that spends prolonged period unprotected in Hyperspace, will break apart. An AE Suit will protect the wearer, allowing them to spend long periods in Hyperspace. 

It is believed that telepathy is routed through Hyperspace. Hyperspace does not obey the same physical laws as normal space, in particular time is changed so that two things from different times may be close together in Hyperspace.

As a Tomorrow Person jaunts there is a great deal of interference created as they pass into Hyperspace. This appeared as some bright flashing lights. John discovered a technique that would stop the interference, allowing the Tomorrow Person to jaunt without the lights.