Last time on Arrow was part 2 of the show's Black Canary trilogy. So far, Laurel Lance, as Black Canary, found her worth as a super-heroine being put to the test when she battled Brick. Throughout the conflict, she suffered injuries that caused the pain of her losing her sister Sara (a.k.a. "Canary") to return, leading her to almost give up on surpassing her dead sister.
Fortunately, she managed to pass the test to prove her worthiness as a heroine with the help of Roy Harper/Arsenal, John Diggle, and Felicity Smoak, who decided to return to Team Arrow when realizing that Oliver Queen's/Arrow's absence could never in the way of the team's being able to help those in danger.
Meanwhile, Malcolm Merlyn found himself debating with his daughter Thea Queen on how to deal with Ra's Al Ghul when he comes to find them, whether it was to exit Starling City or stay and fight back.
Most importantly, Seo provided way for Oliver to avoid capture from the League of Assassins after Oliver recovered from his fight with Ra's Al Ghul, but unknown to Oliver and Tatsu (Seo's wife), Seo is still helping the League hunt down Malcolm Merlyn. Now, we arrive at the point where we look at the final part of Arrow's Black Canary trilogy, "Uprising".