The Flash
Season 4 Episode 1: “The Flash Reborn”
Directed by Glen Winter
Written by Todd Helbing & Eric Wallace
Starring Grant Gustin, Jesse L. Martin, Danielle Panabaker, Candice Patton, Carlos Valdes, Tom Cavanagh, Keiynan Lonsdale
Created by Greg Berlanti, Andrew Kreisberg, Geoff Johns
The CW
Air Date: Tuesday, October 10th, 2017, 8:00pm

Warning! Spoilers below for the season 3 finale of The Flash!

Last season on The Flash, Savitar, aka warped Barry remnant (Grant Gustin), was finally defeated without Iris (Candice Patton) dying because HR (Tom Cavanagh) sacrificed himself instead. There was a giant fight – Killer Frost (Danielle Panabaker) ended up saving Cisco (Carlos Valdes), and Iris took out Savitar. The speed force needed a sacrifice and showed up as Barry’s mother, insisting he needed to go love there or worlds would be destroyed. Julian (Tom Felton) made a cure but Caitlin didn’t take it, although she was on a path to redemption.

Spoilers below.