With crime at an all time low, Oliver decides to take a break and asks Felicity on a date. However, they're interrupted when a new drug dealer take the name of Count Vertigo and targets the Arrow for death. Meanwhile, Diggle becomes an expectant father and a scientist tries to acquire Queen Consolidated before Oliver can retake his family's business.
Oliver and his team try to find the archer who killed Sara, and discover that a hitman calling himself Komodo had connections to their friends past with the League of Assassins. Meanwhile, Ray continues trying to hire Felicity, and Roy debates whether to tell Oliver why Thea left Starling City.
Felicity tracks Thea to the island of Corto Maltese, and Oliver, Roy, and Diggle got here to bring her back. Meanwhile, Lyla asks Diggle to look into the disappearance of ARGUS agent Mark Shaw, and Laurel looks for an outlet for her frustrations.
Nyssa believes that Malcolm killed Sara and goes after him to avenger her lover's murder. Oliver discovers that he has no choice but to stop her, despite Laurel insisting that he avenger her sister's death. Meanwhile, Thea returns to Starling City and settles in... until Nyssa discovers that she's Malcolm's daughter.
When a cyber attack brings Starling City to its knees, Oliver and Felicity are pushed to their limits to contain the destruction. Life gets even more complicated for Felicity when her mother, Donna, stops by for a surprise visit. Meanwhile, Ted Grant questions Laurel's motives, and Thea buys an apartment with Malcolm's "estate" money, which infuriates Oliver.
Source: The CW
After a body is found strung up in the Wildcat gym, Ted Grant becomes the main suspect. Oliver and Laurel argue over Ted's innocence. Meanwhile, in flashbacks, when Maseo needs Oliver to remember where an informant for China White stashed key information, he asks Tatsu to help jog Oliver's memory. Roy shares a secret with Felicity.
Source: The CW