In this week's all-new episode of "Arrow," fans will meet Nyssa Raatko, the daughter of Ra's al Ghul, and learn about the Lance family through flashbacks.

In the last episode, the Green Arrow was forced to reveal his identify to Roy and Roy officially became a member of Team Arrow, reports Hypable.com. Meanwhile, Walter convinced Moira to run for mayor against Sebastian Blood and Laurel learned that she was disbarred and passed out after a night of heavy drinking. Luckily, Sara returned to save her in the nick of time.

In the upcoming episode, entitled "Heir to the Demon," Katrina Law will guest star as Nyssa, who will come to Starling City on a mission to bring Sara back to the League of Assassins. However, Oliver and Detective Lance are not going to let her leave easily.

The episode will also include a flashback scene of the once happy and complete Lance family. A clip of the scene, however, shows that Sara will receive a text message from Oliver which indicates that this may not take place too long before the infamous Gambit trip.

According to ComicBook.com, the official synopsis for "Heir to the Demon" reads:

"As Laurel (Katie Cassidy) continues to unravel, Oliver (Stephen Amell) and Lance (Paul Blackthorne) try to convince Sara (guest star Caity Lotz) to stay in Starling City and finally reunite with Laurel and Dinah (guest star Alex Kingston). However, Sara's fellow League of Assassins member, Nyssa (guest star Katrina Law, "Spartacus"), comes to bring Sara back to the fold, but when Sara refuses, Nyssa kidnaps Dinah. Realizing she's putting her family in danger by staying in town, Sara considers re-joining the league."

Watch sneak peak videos below.