Tonight's episode of Arrow, "The Scientist", airing at 8 PM ET on The CW, features the long-awaited debut of Grant Gustin as Central City police scientist Barry Allen. To get fans prepared, the network has released two clips, featuring Barry's awkward introduction to Oliver Queen (Stephen Amell), and his conversation with Felicity (Emily Bett Rickards), where he tries to learn more about Starling City's hooded vigilante.

A seemingly impossible robbery at Queen Consolidated's Applied Sciences Division brings Central City police scientist Barry Allen (guest star Grant Gustin) 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 (guest star Bex Taylor-Klaus) 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 (guest star Kevin Alejandro), and their search ultimately gets one of them seriously injured.

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