Arrow (2012– )
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The Scientist 

0:59 | Trailer
After an impossible break in at Queen Consolidated, CSI Barry Allen comes to Starling to help with the investigation, Sin asks Roy for help so Thea tags along.


Michael Schultz


Greg Berlanti (developed by), Marc Guggenheim (developed by) | 5 more credits »





Episode cast overview, first billed only:
Stephen Amell ... Oliver Queen / The Arrow
Katie Cassidy ... Laurel Lance (credit only)
David Ramsey ... John Diggle
Willa Holland ... Thea Queen
Emily Bett Rickards ... Felicity Smoak
Colton Haynes ... Roy Harper
Manu Bennett ... Slade Wilson
Susanna Thompson ... Moira Queen
Paul Blackthorne ... Quentin Lance
Grant Gustin ... Barry Allen
Kevin Alejandro ... Sebastian Blood
Celina Jade ... Shado
Caity Lotz ... Sara Lance
Summer Glau ... Isabel Rochev
Bex Taylor-Klaus ... Sin


A seemingly impossible robbery at Queen Consolidated's Applied Sciences Division brings Central City police scientist Barry Allen to town. Citing a similar case back home, Barry offers to help Oliver and team with the investigation. Oliver senses there is more to Barry than meets the eye, but he's distracted by the similarities between this current case and something that happened on the island. Meanwhile, Felicity takes a liking to Barry, which doesn't go unnoticed by Oliver. Sin asks Roy for help when a friend of hers goes missing. Roy is surprised when Thea not only encourages him to help, but joins the search. Unfortunately, Sin's friend is connected to Brother Blood, and their search ultimately gets one of them seriously injured. Written by Salman Ali

Plot Summary | Plot Synopsis


TV-14 | See all certifications »


Official Sites:

Sky [United Kingdom]




English | Arabic

Release Date:

4 December 2013 (USA) See more »

Company Credits

Show more on IMDbPro »

Technical Specs

Sound Mix:




Aspect Ratio:

16:9 HD
See full technical specs »

Did You Know?


This episode starts off with a shot of the sky and a flash of lightning. This is a direct nod to Barry Allen (aka The Flash), who is introduced this episode. See more »


After Barry leaves Felicity, Oliver arrives and Felicity and Dig are both at the hiding place, Oliver is wearing the same clothes, therefore, Felicity has changed her outfit completely and her makeup too. See more »


Felicity Smoak: Mrs. Queen, welcome back to the company.
Moira Queen: Thank you.
Felicity Smoak: You look fabulous. Really, better than ever. Did you do something to your hair?
Moira Queen: Yes. I shampooed it without eight woman and a guard watching me.
Felicity Smoak: Is it okay to laugh? Because I was ordered not say anything about you being in prison just to avoid any awkward exchanges.
Oliver Queen: Like that one.
See more »


Featured in WatchMojo: Top 10 Arrow Episodes (2016) See more »


Arrow End Theme
Composed by Blake Neely
See more »

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