Sector V is the base of operations for the Kids Next Door appointed to said areas. Apart from the actual base, Sector V is a suburban town with houses and such. Sector V is a KND sector consisting of Numbuh One, Two, Three, Four and Five. They live in a suburban area presumably in the United States, where their treehouse is also stationed.
War Against Fuse
In the first attack by Fuse, Sector V is being defended by Numbuh Two and Five. After being overrun by the Fusion Spawns, Blossom and Bubbles rescue the two from falling to their deaths. After a quick save, they are still no match for the Fusion invaders, until Dexter arrives with Ben (Four Arms), Mac, and Bloo.
Long lasting war
The safe zone in Sector V is the KND Treehouse, which you can climb up by going to the back of the house jumping on the boxes and so on. To keep Fusion monsters from attacking the treehouse, the base is being propelled by anti-gravity technology provided by both Dexlabs and Mandark Industries. Metal chains keep the base tethered to the ground.
Nearby, lies the KND Training Area which is slowly becoming an Infected Zone, and Hero Square, a memorial made up of holograms and statues, showing memorials to lost heroes. In the past, only Buttercup is represented in Hero Square, but in the Future, Dexter, Bloo, Mojo Jojo, Ben, and Edd are as well. South of Sector V is Pokey Oaks North.
The Soulos might be called Soulo because they don't go in packs, his name might be spelled wrong. These are weaker copies of Spookas and Spinetinglers, but there's another thing different: they're demolition experts with their Soulo Shell bombs.
They take 1 hit to kill, since they're bombs by the Soulos. Don't underestimate them, they might be small and weak, but when they explode, they blow up stainless steel, so watch out! If you're near the base of the chains to the treehouse, that's where's they'll be, destroy them before they destroy the chains.