Owner: Veronica Cale
Designation: Independent Island Nation
First Appearance: Wonder Woman #157 (October, 1965)
Oolong Island is a remote island located in the Yellow Sea off the west coast of North Korea.
Originally built by Intergang to create superweapons for their schemes, the cartel kidnapped various intellectually superior but morally questionable scientists and inventors and gave them free reign over the island with unlimited resources. As Chang Tzu was a member of the Great Ten; China's metahuman defender force, Oolong Island fell under Chinese jurisdiction and became a national stronghold for the country. During the year following the Infinite Crisis, under orders from Beijing, Chang Tzu commandeered the likes of Doctor Sivana, T.O. Morrow and Will Magnus to design and build doomsday weapons known as the Four Horsemen to attack Kahndaq.
Following retribution from Black Adam the island continued operating despite Intergang's withdrawal. With the intention of shutting down its activities, Checkmate employs the Outsiders to infiltrate the island, however, the team is overwhelmed and Nightwing, Sasha Bordeux and Captain Boomerang (Owen Mercer) are captured and transported to North Korea for experimentation. They were later rescued with Batman's aid.
After falling into despair over aiding in the construction of the Four Horsemen, Veronica Cale had observed the arrival of various heroes attempting to retrieve the captured Adam from Oolong's facilities as well as the arrival, and subsequent departure, of the combined Outsiders/Checkmate taskforce months later and noted that, while heroes were willing to treat the symptoms of the island's "Science Squad" they were unwilling, or unable to, shut it down permanently. Returning to the facilities, Cale seduced various scientists into revealing the island's command structure and from there she worked her way up to overthrow Chang Tzu and become the President of Oolong Island.
Attaining sovereignty of the island and independence from the likes of North Korea and China, Cale now oversees the island's "Science Squad" in an effort to repent for the monstrosities her ambition had previously unleashed.
As a means of income, Cale converted a part of the island into a holiday resort and additionally employed the Doom Patrol to act as the island's security team.