The premise of the show concerns the emergence of the next stage of human evolution, who are classified as Homo superior, the next stage after Homo sapiens. However, these Homo superior prefer to call themselves "the Tomorrow People." Born to Homo sapiens parents, an apparently-normal child might at some point between childhood and late adolescence experience a physically and mentally stressful process called "breaking out". Surviving this process means becoming a "Tomorrow Person", capable of various psi powers such as telepathy, telekinesis, and teleportation (called jaunting in the show, presumably after the term used in the novel The Stars My Destination). However, they are unable to deliberately kill others (though capable of using non-lethal weaponry such as "stun guns" or disabling an aggressor using a martial arts throw). This inhibition is referred to as the "prime barrier."

The Tomorrow People operate out of a secret laboratory built in an abandoned London Underground station. They watch for new Tomorrow People "breaking out" to help them through the process and sometimes deal with attention from extraterrestrial species, especially from the "Galactic Federation" which oversees the development of telepathic species. In addition to their psi powers, they also use advanced technology such as the biological computer TIM, which is explicitly capable of original thought and can augment their psychic powers. While they reveal their existence to some (especially their parents), they generally operate in secrecy for fear that normal people (whom they term "saps", an abbreviation for Homo sapiens) will either fear and victimise them because of their special powers or try to exploit their powers for military purposes.

Price produced the revival for Tetra Films (a Thames Television subsidiary) and Nickelodeon between 1992 and 1995. However, this version is markedly different from its predecessor: none of the original cast, title sequences, or music were used, nor the computer TIM. The "Lab" is replaced by an alien spaceship in the South Pacific to which Tomorrow People are drawn. The distinctive belt buckles were also removed because the new Tomorrow People do not need them for teleportation.

Nickelodeon broadcast the original 1970s version in the United States in the early 1980s, and broadcast all five stories (The Tomorrow People, The Culex Experiment, Monsoon Man, The Rameses Connection and The Living Stones ) from the new series in the '90s.

A comic strip version was also produced, written by Angus P. Allan and printed in TV comic Look-In.

In 2001, Big Finish Productions launched an audio series based on the original concept, produced by Nigel Fairs. Nicholas Young and Philip Gilbert reprised their roles as John and TIM, with Helen Goldwyn and Daniel Wilson appearing as Elena and Paul, the new Tomorrow People. Some releases also feature other original cast members, such as Peter Vaughan-Clarke, Elizabeth Adare and Mike Holoway (notably Trigonometry). Trevor Littledale took over the role of TIM in the audio series from The Warlock's Dance onwards after Philip Gilbert's death.

• The Tomorrow People Episode Guide & Photo Gallery
• British Film Institute Screen Online
• Fantom Films
• Big Finish
• The Tomorrow People Filmography (Original Series)