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 (guest star Charlotte Ross), stops by for a surprise visit. Meanwhile, Ted Grant (guest star J.R. Ramirez) questions Laurel's motives, and Thea buys an apartment with Malcolm's "estate" money, which infuriates Oliver. Nolan Funk guest stars as Felicity's ex-boyfriend.
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