Next week, Arrow fans will get their first glimpse at Grant Gustin as Barry Allen, a.k.a. The Flash in Part 1 of the midseason finale "The Scientist", airing Wednesday, December 4 at 8 PM ET on The CW. The network has released the second promo for this upcoming episode, where Oliver Queen (Stephen Amell) is in danger of having his secret identity compromised. The second half of the Season 2 midseason finale, "Three Ghosts", airs Wednesday, December 11.

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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