Alpha-Omega

Alpha-Omega virus is a deadly Bio Weapon. It was created by BTHK Biotech in Hong Kong. It consists of two corresponding part: Alpha and Omega. General Matthew Shrieve used it to kill thousands of innocent people in Hong Kong including Akio Yamashiro. Later Maseo Yamashiro handed over the bio weapon to Ra's al Ghul which Nyssa al Ghul hid it in the handle of her weapon. After capturing Nyssa Ra's gave the virus to Oliver telling him to destroy his city. Ra's used it to kill many innocent people of Starling City but they were cured by Ray Palmer with his nano-tech.

History
After getting both the Alpha and Omega General Shrieve mixed the virus and made it ready to launch over Hong Kong. Oliver Queen, Maseo Yamashiro and Tatsu Yamashiro tried to retrieve the Bio Weapon but they found out it was just for a distraction. When Oliver tried to retrieve it to Hong Kong market place the Bio Weapon fell on ground and created a huge viral outbreak. Many innocent people died including Maseo and Tatsu's son Akio Yamashiro.

Few days after the outbreak. Maseo journeyed to Nanda Parbat and gave the virus to Ra's al Ghul. But however Nyssa al Ghul stole it and kept it hidden in the handle of her sword. After Oliver capturing Nyssa Ra's took the Bio Weapon from the handed to Oliver to destroy Starling. But however Ra's took it and unleahed it to Starling City in four different location. Ray Palmer cured the people who were infected with his nano-tech.

Season 3

 * "The Climb"  (security footage)
 * "The Return"
 * "Nanda Parbat"  (mentioned)
 * "Broken Arrow"  (mentioned)
 * "The Fallen"
 * "Al Sah-him"
 * "This Is Your Sword"
 * "My Name Is Oliver Queen"