Sark Island

In Reality Z-25 31-H, Sark Island, (COMIC: Kate Five vs Symbiote - Chapter 5) or the Island of Sark, (PROSE: Nexus Girl's Lament) was a small island in the English Channel, located about 60 km from Cherbourg, France. It was notorious as “one of the few places in the world where cars are banned, and only horses and tractors are permitted”. It was there that Ohmega built a secret facility, which did not appear on any maps. After capturing her, Emerald Valkyrie took Kate Five and the Symbiote there for study, and as such, it was there that Balthus was subsequently spawned. (COMIC: Kate Five vs Symbiote - Chapter 5)

A few minutes after Kate Five's escape, the Sark Island facility was again breached by people who were looking for her: this time, New York City's Centennia and Captain Perfect. Centennia let the two of them get captured, hoping to get information, but broke her restrains with ease as soon as she heard that they'd “just missed” Kate. Centennia then got a phone call from Professor Madison, explaining that Kate and her friends had in fact teleported to New York, and were now waiting for her in the Fortress of Evening. (COMIC: The Search For Kate Five)