Cassiopeia Delta VII (also known as Serafin's Planet) was a planet in the Alpha or Beta Quadrants, and the location of a Human colony established by individuals suffering from an unnamed genetic disease. Their ability to overcome their illness also served them in taming this harsh planet.

In late 2365 or early 2366, seismic shifts on Serafin's Planet exposed a new and unknown radiation source, which had the effect of curing the colonists' illness, but also created within them the need to feed on the life-force of other living beings. These seismic activities gradually intensified to the point where the planet was literally tearing itself apart, and the colonists had to call for evacuation. The USS Enterprise-D responded to this call on stardate 43201.8. (TNG comics: "Serafin's Survivors", "Shadows in the Garden")

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 • Brentis VI • Treva • Vagra II • Ornara • Brekka • Vandor IV • Sarona VIII • Dytallix B
2365	'aucdet 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