Wednesday night's all-new episode of "Arrow" will mark the return of Sara Lance, who will struggle to regain her humanity after she is resurrected from the dead through the Lazarus Pit.

After Laurel Lance learned more about the Lazarus Pit and the mysterious land of Nanda in the last episode, she realized that she could use the Lazarus Pit to resurrect her sister, Sara. However, once Sara is brought back to life, she will be a completely different person due to the side effects that will occur from using the Lazarus Pit after being dead for months. Unlike Thea, whose life was also restored through the Pit, the side effects will be far worse on Sara and follow her even after she joins the spin-off "Legends of Tomorrow" in 2016.

"Her story is really a simple one. It's her trying to regain her humanity, trying to find a human connection," said "Legends of Tomorrow" executive producer Phil Klemmer to TVGuide. "It's kind of this paradox that she's selected for the team because she's this ruthless, cold-blooded assassin and what she really wants is to feel again. And these two things are at odds."

Fortunately, even though there will be drastic changes in Sara, her sister Laurel will continue to stand by her side.

According to CarterMatt, the synopsis for the upcoming episode, which is entitled "Restoration," reads as follows:

The growing tension between Oliver (Stephen Amell) and Diggle (David Ramsey) puts both their lives at risk when they go after Damien Darhk (guest star Neal McDonough) and a H.I.V.E. deployed meta-human. Meanwhile, Laurel (Katie Cassidy) talks Thea (Willa Holland) into returning to Nanda Parbat to ask her father (John Barrowman) to put Sara (guest star Caity Lotz) into the Lazarus Pit. However, Laurel is surprised when Nyssa (guest star Katrina Law) refuses to do it."

"Arrow" Season 4 Episode 3 will air on Wednesday, Oct. 21.