Arrow (2012–2020)
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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

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Technical Specs

Sound Mix:




Aspect Ratio:

16:9 HD
See full technical specs »

Did You Know?


In this episode Diggle says, "My God, what's next, Aliens?" This may be a reference to an up and coming show, Star-Crossed (2014) that focuses on alien and human interaction. See more »


When Barry discovers the sedative being used in Blood's mirakuru formula is ketamine, his computer screen is shown with a diagram of the substance's molecular structure. What is shown here is very close to what medical grade ketamine's chemical formula looks like, but what is shown is the precursor to ketamine. Medical grade ketamine is actually racemic ketamine, the chemical formula shown on the screen is for racemic ketamine's enantiomer, known as (S) ketamine. A substance that is racemic has the same chemical makeup and structure as the original substance, but its structure is the mirror opposite, so in other words it looks like an upside down version of the original chemical diagram. See more »


Barry Allen: Uh, it takes about 1200 50-foot pounds of torque to break someone's neck. See the mark on the guard's neck? The bruising patterns suggests the killer used only one hand. I'm guessing you don't know how hard it is to break someone's neck.
Oliver Queen: Hmm? No. No idea.
See more »


Featured in WatchMojo: Top 10 Arrowverse Crossover Episodes (2017) See more »


Arrow End Theme
Composed by Blake Neely
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