Added by 8of5

Tigan-7 was a planet, the home to the Tigan race. The planet had a great reserve of geothermic energy, which the Tigan use to power the containment field of the gravimatrix, their black hole based power facility.

Tigan was visited by the USS Enterprise-D on stardate 41590.8, at which point Enterprise personal uncovered a global conspiracy which had been repeatedly rewriting Tigan history using the Tigan's interface technology. (TNG comic: "History Lesson")

Some time later the technology used in the Tigan conspiracy was replicated on Langer 14 where it was used to rig an election. (TNG comic: "Space Seeds")

In the original references in "History Lesson" the planet was only ever referred to as Tigan. However in the blurb released for the issue prior to publication it was referred to as Tigan-7, the addition of the numeral was confirmed in-universe when the planet was referenced in "Space Seeds".

Planets visited by the USS Enterprise-D
2364	Earth • Deneb IV • Archaria III • Ligon II • Styris IV • Omicron Theta • Gamma Tauri IV • Delphi Ardu IV • Peacekeepers' World • Parliament • Rubicun III • Quadra Sigma III • Haven • Torona IV • Angel I • Starbase 74 planet • Bynaus • Tigan VII • Syntagus Theluv • Tarod IX • Faltos • Persephone V • Mordan IV • Aldea • Velara III • Relva VII • Minos • Treva • Vagra II • Ornara • Brekka • Vandor IV • Sarona VIII • Dytallix B
2365	'audet IX • Tenara • Epsilon Miranda V • DQN 1196 • Raimon • Feenix-Denn IV • Himalias V • Thiopa • Gravesworld • Ramatis III • Solais V • Gagarin IV • Elysia • Iconia • Pacifica • Bringloid V • Mariposa • Drema IV
2366	Kavis Alpha IV • Tau Cygna V • Galorndon Core • Acamar III • Orelious IX • Bre'el IV • Cassiopeia Delta VII • Archer IV • Betazed • Vulcan • Rutia IV • Jouret IV
2367	Saturn • Earth • Turkana IV • Camus II • Tagus III • Adelphous IV • Evadne IV • Qo'noS
2368	Qo'noS • El-Adrel IV • Valo I • Valo II • Qualor II • Vulcan • Galorndon Core • Hermeticus II • Votar VII • Sindar • Tessen III • Rajatha Prime • Earth
2369	Frigis • Hobson Delta II • Bajor • Eloh • Riat • Atrea IV • Nervala IV • Enoch VII • Earth
2370	Terrellian crashsite world • Marijne VII • K'Trall • Dessica II • Barradas III • Calder II • Vulcan • Kesprytt III • Enoch VII • Dyson Sphere • Hera • Atrea IV • Vacca VI • Dorvan V • Hera • Krantin • Syng II • Earth
2371	Sindikash • Thanet • Ntignano • Damiano • Veridian III