Arrow Brings Barry Allen to the Small Screen December 4

The upcoming eighth episode of Arrow's second season, due to hit your screens on December 4, will feature Grant Gustin's first appearance as Barry Allen (The Flash), Flash TV News confirmed tonight. The CW released a first full description of the episode, which you can read below: BARRY ALLEN COMES TO STARLING CITY — 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 (Stephen Amell) 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 (Emily Bett Rickards) takes a liking to Barry, which doesn't go unnoticed by Oliver.  Sin (guest star Bex Taylor-Klaus) asks Roy (Colton Haynes) for help when a friend of hers goes missing.  Roy is surprised when Thea (Willa Holland) 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.  Michael Schultz directed the episode with story by Greg Berlanti & Andrew Kresiberg and teleplay by Andrew Kreisberg & Geoff Johns (#208). They do love their Applied Sciences Divisions in the DC Universe, don't they? Anyway, this is the first of three episodes expected to star Gustin as Allen this year, leading to a spinoff based on The Flash due on The CW in the fall. You can check out the link above for more Season Two spoilers. What's this seriously injured thing, anyway? Could Roy Harper be losing a hand or an arm, a la his Arsenal days? And with H.I.V.E. being name-dropped here, could the "similarities between this current case and something that happened on the island" be related to Deathstroke or Ravager?