17. Slade's First Flashback Appearance

Slade Wilson appears for the first time in Arrow (S1E13) to introduce himself as both the brutal and highly proficient instructor of Oliver Queen. Oliver meets Slade, a seasoned soldier who teaches him survival and combat skills, while stranded on Lian Yu. Oliver learned all necessary warrior skills from Slade's training before his Season 2 turn into the series' most dangerous antagonist. Slade ensures Oliver that he fulfills every vow he makes through his words: "I keep my promises, kid."
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Edited by Debanjana