Deadshot (guest star Michael Rowe) returns to Starling City after taking down a U.S. Ambassador and six others overseas. Diggle is determined to see his brother’s killer dead, with or without Ollie’s help. Meanwhile, Laurel takes drastic steps to protect a young witness, exacerbating friction between Tommy and Oliver. Later, Roy Harper (guest star Colton Haynes) unconventionally pursues all leads to find his new hero, but runs afoul of Detective Lance. Back on the island, Oliver recalls how Shado (guest star Celina Jade) helped him incrementally gain confidence with a bow and hit the target for the first time. Wednesday, April 24 at 8/7c on The CW.