
Grant Gustin first appeared as Barry Allen during Season 2 of Arrow, and then starred as The Flash for nine seasons, concluding on May 24, 2023. Almost two and a half years later, he shared that the show’s final episode wasn’t the ending he envisioned. However, there was one positive aspect to how the last episode, “A New World, Part Four,” was filmed.
So, I was chatting at SpaceCon recently, and I was telling everyone about filming the Flash finale. It was a bit of a scramble, honestly. We actually had to completely rework the original plan for the episode because I got sick right before we started shooting. It threw everything off, but we managed to pull it together!
We had to revise the script because I ended up getting COVID about a week and a half before filming finished. It had been two years into the pandemic, and I hadn’t caught it until then. I kept testing positive, which meant I couldn’t return to set. Production paused for a day or two while they rewrote some scenes, and I was unable to film for at least three or four days.
Filming a single TV episode typically takes three or four days, and it was particularly difficult for The Flash’s final episode to fall behind schedule. The episode drew inspiration from shows like The Office and Lost, making the delays even more frustrating. However, prioritizing the health and safety of the cast and crew meant the script had to be changed, including removing a planned return appearance by Grant Gustin in one of his other major roles on the show. He explained further:
I was originally scheduled to be in the scene where Savitar appeared, wearing the prosthetic scar and makeup alongside the other villains. The plan was for me to be inside the Savitar suit. There were also complications during filming – my stunt double ended up with some screen time, and we had to work around his scenes.

You know, as a big fan of the Arrowverse, I always got the sense Grant Gustin really believed in The Flash. He was super confident from the start that the show would be a hit and last a long time. But apparently, not everyone shared his optimism! One of his co-stars actually wasn’t so sure it would take off – can you believe it? It’s funny to think about now, considering how popular The Flash became.
Carlos Valdes, who played Cisco on The Flash, described leaving the Arrowverse as feeling strangely vulnerable, comparing it to sharing intimate photos. He’s now shared his thoughts on his time with the show and whether he’d consider returning in the future.
The series finale of The Flash kicked off with Eddie Thawne, as Cobalt Blue, bringing together previous speedster villains – Reverse-Flash, Zoom, Godspeed, and Savitar – to fight Team Flash. Savitar, notably, was a past version of Barry Allen who served as the big bad in Season 3. Though Tobin Bell returned to voice Savitar, the show’s team couldn’t film scenes of the villain unmasked and applying makeup to Grant Gustin to recreate the facial disfigurement Eobard Thawne once referenced.
Even though the show faced challenges, Grant Gustin found the final scene he filmed for The Flash especially meaningful. It was also the very last scene of the series, showing Barry Allen running through Central City, as pictured above. Gustin shared his thoughts, saying:
It felt strangely fitting to spend my final day of work alone in front of a green screen – a little sad, actually. I’d spent so much time in costume, acting against nothing but a blank screen! The very last thing we filmed was Barry running, with the camera closing in on him looking content. It was a perfect way to end the series.
Before this, Barry Allen shared his super speed with three other people – Avery Ho, Max Mercury, and Jess Chambers – by channeling it through a lightning bolt. It’s fun to picture what Central City will be like with three new speedsters! While the recent changes to the show were tough, actor Grant Gustin is happy with this positive outcome. Originally, Gustin liked the idea of Barry becoming the lightning that gave him his powers, but the show’s creator, Eric Wallace, steered him in a different direction.
If you’re looking to rewatch the nine seasons of The Flash, it’s available on Netflix, along with Arrow, Legends of Tomorrow, Supergirl, and Black Lightning. You can find Batwoman, plus shows connected to the Arrowverse like Superman & Lois and Stargirl, on HBO Max.
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2025-11-02 21:09