When you watch Arrow Season 4 Episode 21 online, you'll find out what happens when Felicity brings her dad on board to help save the world from Darhk.

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Episode Details

On Arrow Season 4 Episode 21, Felicity seeks help from her father to try to stop Damien Darhk from destroying the world with nuclear missles.


Rating: 4.5 / 5.0 (78 Votes)
Show:
Arrow
Season:
Episode Number:
21

Arrow Season 4 Episode 21 Quotes

Donna: I may not be in Mansa, but I know how to read, sweetie.
Lance: I think it's Mensa, actually.

Predictability is your flaw too. Every time my life starts to suck, you show up.

Thea