Arrow season 1 episode 22
Watch online episod 22 – "Darkness on the Edge of Town"
Malcolm Merlyn, in his archer costume, goes to Unidac Industries to tie up loose ends by murdering scientists that worked on the seismic device that will be used to level the Glades. Oliver and Diggle devise a plan where Diggle dresses as the vigilante and kidnaps Oliver and Moira in an attempt to uncover the truth about the Undertaking. The plan works and Oliver, Felicity, and Diggle break into Merlyn Global to hack the mainframe and find the device. Oliver convinces Tommy to get back together with Laurel, but when he learns that he could give up being the vigilante if he stops the Undertaking, Oliver decides to reconcile with Laurel himself; later, Tommy witnesses Oliver and Laurel becoming physically intimate. That night, Diggle goes after the device, but Malcolm learns of the system hack and has the device moved. The vigilante attempts to kill Malcolm, who reveals to the vigilante that he is the other archer; the two fight and Malcolm gets the upper hand, discovering Oliver’s secret. Meanwhile, Walter reveals that he knew that Moira was part of his kidnapping and gives her divorce papers as a result. In a flashback, Fyers reveals that he plans to cripple the Chinese economy by blowing up aircraft going into China. Fyers then murders Yao Fei after forcing him to take credit for the attacks via video recording.