Vandros IV was a planet in the Gamma Quadrant, under the Dominion's control, and one of its most outlying worlds. It was also the location of an Iconian gateway that was discovered by Dominion scientists in the 2370s.
In 2372, the scientists attempted to restore it, but their Jem'Hadar soldiers rebelled and seized the gateway. They began to work on the gateway on Vandros themselves, stealing technology from Deep Space 9 among other places.
On their way back to Vandros, the rogue Jem'Hadar attacked and crippled Weyoun's warship. When they were rescued by Benjamin Sisko and the crew of the USS Defiant, the two crews agreed to work together and attack the ziggurat on Vandros that held the gateway. They were successful in destroying the gateway, although both crews suffered heavy losses. (DS9 episode: "To the Death", TNG novella: Gateways: "What Lay Beyond": "The Other Side")
According to records discovered by Ambassador Worf and allied military officers and civilians in 2409, the Iconians maintained level 9 surveillance of Vandros IV and nearby worlds. The records also stated that the Iconians considered the Dominion too strong to dominate without first subsuming the major powers of the Alpha and Beta Quadrants. (STO mission: "Sphere of Influence")
|planets visited by ships named Defiant|
|USS Defiant (NCC-1764)||Golmira • Traelus II|
|USS Defiant (NX-74205) (I)||2371||Karemma • Callinon VII • Founders' homeworld • Trill • Cardassia • Meridian • Orias III • Earth|
|2372||Bajor • Cha'Xirrac • Free Haven • Vandros IV • class L planet crash site • New Founder homeworld|
|2373||Torga IV • Ajilon Prime • Cardassia • Solosos III • Gaia IV|
|2374||Argolis Cluster planet • Chin'toka planets|
|USS Defiant (NX-74205) (II)||Europa Nova • Torona IV • Narendra III • Vahni Vahltupali homeworld • Prentara • Luthia • Bajor|
|Defiant (mirror universe)||Bajor|
|Gamma Quadrant planets and planetoids|
|Alamenta II • Argratha • Batrus • Bopak III • Brax • Bronis II • Caldonia III • Callinon VII • Dionby IV • Dosa II • Eco • Ee • Empersa • Enskith VI • Erabus Prime • Errikang VII • Founders' homeworld • Gaia IV • Hoek IV • Idran IV • Innerol V • Karemma • Keltara • Kendaray • Kigus III • Kurrill Prime • Laertes • Lesurgis XXXII • Lodontus III • Merakord II • Meridian • Mundahla • New Bajor • New Founder homeworld • Oason • Overne III • Parada IV • Rindamil III • Rintanna • Shelvar VI • Skrree • T-Rogoran Prime • Tevlin-De • Threska II • Torad V • Torga IV • Vadris III • Vandros IV • Varala • Vanìmel • Vhetti Prime • Vrynax II • Yadera II • Yadera Prime • Zaria V • unnamed Gamma Quadrant planets and planetoids|