Flash: Grodd Lives

"Grodd Lives" is the twenty-first episode of season one of the superhero fantasy series The Flash. It was directed by Dermott Downs with a teleplay written by Gabrielle Stanton and Andrew Kreisberg based on a story treatment by Kreisberg and Greg Berlanti. It first aired on the CW Network on Tuesday, May 5th, 2015 at 8:00 pm. In this episode, Harrison Wells presents Barry Allen the opportunity to go back in time and save his mother.