Barry Allen is ready to make an appearance this season on Arrow, and we've got your first look! Grant Gustin, who played evil Dalton Warbler Sebastian on Glee, will appear as Barry Allen in Arrow's eighth and ninth episodes of season 2, before getting his own spin-off pilot on The CW! But that's not all. While the pilot was originally supposed to air as a "backdoor pilot" during Arrow Season 2. Now, the CW has increased it to a stand-alone pilot. That means a bigger budget, more status, and even cooler effects. Congrats, Grant!