Arrow season 8, episode 5, "Prochnost," is largely praised by critics as a nostalgic and emotionally resonant installment focusing on family bonding, specifically between Oliver, Mia, and William in Russia. The episode is highlighted for featuring fan-favorite characters like Anatoly Knyazev and Roy Harper, while setting up the Crisis on Infinite Earths crossover. Read the full review at Den of Geek . Arrow Season 8 Episode 5 Review: Prochnost - Den of Geek