The Flash showrunner Eric Wallace had planned a two-year storyline involving Seasons 9 and 10, which would have culminated in a final, epic crossover event featuring characters from The Flash, Superman & Lois, DC’s Stargirl, and HBO Max’s Titans. The crossover would have been based on the Blackest Night comic book storyline and involved bringing back dead characters. However, the plans were scrapped due to the cancellation of the show after Season 8.
The showrunner of "The Flash," Eric Wallace, revealed all the ideas he couldn't fit into the final season, including a two-year plan involving seasons 9 and 10, a huge storyline for Chester and Allegra, and a final epic crossover event featuring characters from "The Flash," "Superman & Lois," "Titans," and "DC's Stargirl." Wallace also wanted to bring back former Flash stars Tom Felton and Shantel VanSanten as a married crime-fighting duo named Hot Pursuit, and reveal that Jordan Fisher's character, Bart Allen, had become Barry and Iris' second child.
The Flash showrunner Eric Wallace and actor Grant Gustin discuss the series finale, revealing alternate endings that were considered. Gustin had a fan theory about Barry sacrificing himself to the Speed Force, but ultimately agreed with Wallace's decision to end the show with Barry sharing his powers with three new speedsters. Wallace had an alternate ending involving the Negative Forces storyline, while previous showrunner Todd Helbing had two different ideas that didn't come to fruition. Despite the alternate endings, Wallace is proud of how the show actually ended.
