The 100th episode of Arrow, a modern-day reboot of DC Comics’ Green Arrow superhero starring Stephen Amell, airs on the CW. Neal McDonough (Boomtown), Grant Gustin (The Flash), Susanna Thompson (Star Trek: Voyager), Caity Lotz (Mad Men, Legends Of Tomorrow), and Brandon Routh (Superman Returns) guest star in an episode which is part of a crossover event involving all of the CW’s DC superhero series.
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