We've known for a couple of months that Arrow will finally bring in the most well-known Al Ghul sister, Talia, for the action in the second half of Season 5. Now, though, we finally know how that's going to happen. The official synopsis for "Second Chances," Talia's debut episode on Arrow, has arrived, and it lets us in on how her reveal is going to go down.
TALIA AL GHUL TAKES OLIVER UNDER HER WING --- In his quest to take down Kovar, Oliver (Stephen Amell) gets help from a surprising source -- Talia al Ghul (guest star Lexa Doig). However, when she reveals what she wants from him in exchange, Oliver isn't sure he can accept her help. Felicity (Emily Bett Rickards) attempts to hack the NSA to help free Diggle (David Ramsey) but when her online efforts are flagged, she faces off against an unknown adversary. Meanwhile, Curtis (Echo Kellum) tells the team about a female vigilante, Tina Boland (guest star Juliana Harkavay), he uncovered online who has been wreaking havoc all over the country. Mark Bunting directed the episode written by Speed Weed & Sarah Tarkoff (#511). Original airdate 2/1/2017.
So, we can see here that Talia will, in fact, come onto Arrow via the Season 5 flashbacks that are focused on Oliver's time with the Russian Bratva crime syndicate. Apparently, Talia is in Russia at the same time as Oliver, and is ready and willing to help him get rid of Kovar, as long as she gets something in return, of course. But, it sounds like her price might be a bit too high for Oliver to accept her assistance, at least right away. Oliver made a promise to take down Kovar, though, and he's already been through hell to try to accomplish his goal, so something tells me that, before too long, he will eventually give in to Talia's demands in order to get her help.
Oliver is pretty damn tough and resourceful, but taking on a man like Kovar is a tricky task for a lone wolf. Talia is sure to be a badass ally for Oliver to have on his side, even if he will owe her big time for the helping hand. As someone who was raised in the League of Assassins, Talia has mad skills as a fighter. In the comics, she's always portrayed as someone of peak physical conditioning who's been trained in a wide variety of martial arts, is excellent at hand to hand combat and proficient with most handheld weapons. She's also very well educated traditionally, and has advanced degrees in business, engineering and biology. So, yeah, Talia will likely have both the smarts to try and take Kovar down efficiently and the fighting skills to deal with any trouble should a plan go awry.