Isabel Rochev (Summer Glau) returns for "Deathstroke," as she intends to take Queen Consolidated away from Oliver.
Despite the cuffs, Slade makes his move against Oliver on Arrow. "Deathstroke" is the 18th episode of the show's second season.

Arrow Season 2 Episode 18 Quotes

Oliver: They're calling you Deathstroke.
Slade: That's a bit flamboyant. I like it.

Well, I told a guy the truth and he got struck by lightening. To be fair, it probably won't happen again. Statistically.