The Man Who Saved Central City

"The Man Who Saved Central City" is the first episode of the second season of The Flash, and the twenty-fourth episode overall. It aired on October 6, 2015.

Synopsis
Picking up months after the Singularity attacked Central City, Barry is still struggling to forgive himself for Eddie’s death. Concerned about putting his friends in danger, Barry has pushed everyone away and has chosen to protect the city on his own. When a meta-human named Atom Smasher attacks the city, Iris tells Barry that he needs to let his friends help him protect the citizens of Central City. Meanwhile, Cisco helps Joe with his Meta Task Force.

Production
Filming began on July 7, 2015.

Trivia

 * Cisco describes Barry as having gone "Lone Wolf McQuade", a reference to the 1983 film of the same name in which the protagonist prefers to work alone.
 * Barry receives numerous letters from Weathersby & Stone LLP, a reference to Taylor Wethersby and Eli Stone, the two lead characters of Eli Stone, a TV series created by Greg Berlanti and Marc Guggenheim.
 * Cisco states that the distress signal that he creates to lure Atom-Smasher was likely inspired from a comic book he read. This is a tongue-in-cheek reference to the Batsignal of the Batman comics.