The Flash — “The Darkness and the Light” — Image FLA205A_0044b.jpg — Pictured (L-R): Ciara Renee as Kendra Saunders, Grant Gustin as Barry Allen and Carlos Valdes as Cisco Ramon — Photo: Katie Yu/The CW — © 2015 The CW Network, LLC. All rights reserved.

The Flash — “The Darkness and the Light” — Image FLA205A_0063b.jpg — Pictured (L-R): Shantel VanSanten as Patty Spivot and Grant Gustin as Barry Allen — Photo: Katie Yu/The CW — © 2015 The CW Network, LLC. All rights reserved.

The Flash — “The Darkness and the Light” — Image FLA205A_0087b.jpg — Pictured: Carlos Valdes as Cisco Ramon — Photo: Katie Yu/The CW — © 2015 The CW Network, LLC. All rights reserved.

The Flash — “The Darkness and the Light” — Image FLA205A_0124b.jpg — Pictured (L-R): Ciara Renee as Kendra Saunders and Carlos Valdes as Cisco Ramon — Photo: Katie Yu/The CW — © 2015 The CW Network, LLC. All rights reserved.

The Flash — “The Darkness and the Light” — Image FLA205A_0167b.jpg — Pictured (L-R): Carlos Valdes as Cisco Ramon, Grant Gustin as Barry Allen and Danielle Panabaker as Caitlin Snow — Photo: Katie Yu/The CW — © 2015 The CW Network, LLC. All rights reserved.

The Flash — “The Darkness and the Light” — Image FLA205A_0229b.jpg — Pictured (L-R): Carlos Valdes as Cisco Ramon and Grant Gustin as Barry Allen — Photo: Katie Yu/The CW — © 2015 The CW Network, LLC. All rights reserved.

The Flash — “The Darkness and the Light” — Image FLA205A_0242b.jpg — Pictured: Grant Gustin as Barry Allen — Photo: Katie Yu/The CW — © 2015 The CW Network, LLC. All rights reserved

The Flash — “The Darkness and the Light” — Image FLA205A_0264b2.jpg — Pictured: Danielle Panabaker as Caitlin Snow — Photo: Katie Yu/The CW — © 2015 The CW Network, LLC. All rights reserved.

The Flash — “The Darkness and the Light” — Image FLA205A_0294b.jpg — Pictured (L-R): Carlos Valdes as Cisco Ramon and Ciara Renee as Kendra Saunders — Photo: Katie Yu/The CW — © 2015 The CW Network, LLC. All rights reserved.

The Flash — “The Darkness and the Light” — Image FLA205B_0001b2.jpg — Pictured (L-R): Candice Patton as Iris West, Shantel VanSanten as Patty Spivot and Jesse L. Martin as Detective Joe West — Photo: Cate Cameron/The CW — © 2015 The CW Network, LLC. All rights reserved.

The Flash — “The Darkness and the Light” — Image FLA205B_0019b.jpg — Pictured (L-R): Candice Patton as Iris West, Grant Gustin as Barry Allen and Jesse L. Martin as Detective Joe West — Photo: Cate Cameron/The CW — © 2015 The CW Network, LLC. All rights reserved.

The Flash — “The Darkness and the Light” — Image FLA205B_0053b.jpg — Pictured: Malese Jow as Linda Park — Photo: Cate Cameron/The CW — © 2015 The CW Network, LLC. All rights reserved.

The Flash — “The Darkness and the Light” — Image FLA205B_0090b.jpg — Pictured (L-R): Tom Butler as Eric Larkin, Malese Jow as Linda Park and Candice Patton as Iris West — Photo: Cate Cameron/The CW — © 2015 The CW Network, LLC. All rights reserved.

The Flash — “The Darkness and the Light” — Image FLA205B_0103b.jpg — Pictured (L-R): Malese Jow as Linda Park and Candice Patton as Iris West — Photo: Cate Cameron/The CW — © 2015 The CW Network, LLC. All rights reserved.

he Flash — “The Darkness and the Light” — Image FLA205B_0109b.jpg — Pictured: Malese Jow as Linda Park — Photo: Cate Cameron/The CW — © 2015 The CW Network, LLC. All rights reserved.

The Flash — “The Darkness and the Light” — Image FLA205B_0131b.jpg — Pictured (L-R): Malese Jow as Linda Park and Candice Patton as Iris West — Photo: Cate Cameron/The CW — © 2015 The CW Network, LLC. All rights reserved.

The Flash — “The Darkness and the Light” — Image FLA205B_0140b.jpg — Pictured (L-R): Malese Jow as Linda Park and Candice Patton as Iris West — Photo: Cate Cameron/The CW — © 2015 The CW Network, LLC. All rights reserved.

The Flash — “The Darkness and the Light” — Image FLA205B_0306b.jpg — Pictured: Teddy Sears as Jay Garrick — Photo: Cate Cameron/The CW — © 2015 The CW Network, LLC. All rights reserved.

Official Synopsis:

“The Darkness and the Light” — (8:00-9:00 p.m. ET) (Content Rating TBD) (HDTV)

DR. LIGHT COMES THROUGH THE BREACH — Barry (Grant Gustin) learns a new breacher, Dr. Light, has come through the portal and sets off to capture her. Jay (guest star Teddy Sears) tells Barry that Dr. Light was not a threat on Earth-2 and that Barry can reason with her. However, during a fight with The Flash, she blinds him and drops some shocking news about Zoom. Meanwhile, Barry and Patty (Shantel VanSanten) go out on a date. Steve Shill directed the episode written by Ben Sokolowski & Grainne Godfree (#205). Original airdate 11/3/2015.