Omega (Chinese: 歐米茄 Ōumǐjiā), also known under the symbol Ω, is a super-virus created by BTHK Biotech in Hong Kong. It is also the first half of the other virus, Alpha.


Initially, creating a super-antibiotic was the objective, but the result was a super-virus, which came to be known as "Omega".[1]

In 2009, Maseo Yamashiro and Oliver Queen caught wind of Chien Na Wei wishing to find some, so they went to the initial company's lab, finding only an empty vial, which had been stolen earlier by a man for Chien, under the influence of the hypnotic drug, Vitura.[1]



Season 3

Season 5


  1. 1.0 1.1 "The Climb"