"Adrian Chase didn't make me a killer."
"No, five years in hell did that. Five years dealing with this city's worst did that. You've spent a decade dealing with horrors that most people don't even realize exist, and the fact that that didn't turn you into a monster proves exactly the kind of person that you are."
Oliver Queen and Felicity Smoak
"Underneath" is the twentieth episode of the fifth season of Arrow, and the one-hundred-twelfth episode overall. It aired on May 3, 2017.


Things get intense when Oliver and Felicity are trapped in the bunker together. Meanwhile, Lyla and Diggle deal with their martial issues.[src]



Guest starring





  • In Southern California, this episode along with The 100 episode "Die All, Die Merrily" were both postponed to May 6 due to coverage of the Giants/Dodgers game.
  • The flashbacks in this episode takes place between "Schism" and "Legacy".
  • This is the first episode of Arrow to not feature a main (human or otherwise) villain, nor does it involve other villains (although Adrian Chase appears at the end interacting with Oliver's son, William). Instead, Team Arrow faces the Arrowcave, which acts metaphorically as a "villain"; an EMP set off by Chase disabled the base where Oliver and Felicity are trapped, so Diggle and the rest of the team must rescue them before the air in the Arrowcave runs out.
  • Curtis refers to his T-Spheres as Kodo and Podo, naming them after "Dar's thieving ferrets on The Beastmaster".
    • Curtis also mentions former Arrow recurring actor Marc Singer, who portrayed Dar in the film.
  • Curtis refers to an "Earth-shattering kaboom", quoting the catchphrase of the Looney Tunes character Marvin the Martian.
  • Curtis says that it will take "10 seasons of The Bachelor" for the hydrochloric acid to melt through the titanium hinges of the elevator.
  • When Curtis' T-Sphere opens for Felicity to reveal a needle, she quips that it looks like the "Death Star interrogation droid" from Star Wars: Episode IV – A New Hope.


  • When Felicity plans to use the motorcycle to power up the computer, she states that everything with an electronic circuit was fried by the EMP, but being an internal combustion engine, the motorcycle still has power. However, the motorcycle has an electronic ignition system so after an EMP, it would not run either. If the motorcycle was from the 1970s, only then there would be a chance it still used mechanical ignition points and ignition coil to generate sparks.
    • Also, the alternator on the motorcycle would be fried due to the electronic voltage regulator and diode pack. But even if it wasn't damaged, the power of the motorcycle alternator would be insufficient to power the computer.
  • Running the motorcycle to power the computer would reduce the available oxygen even more and fill the bunker with carbon monoxide.


Preparation ran from February 23 until March 3, 2017. Shooting ran from March 6 until March 15, 2017.[1]


  1. Marc Guggenheim (@mguggenheim) - Twitter

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