Kevin Smith opened up about what it was like to work on both “The Flash” and “Supergirl” in an Instagram post he shared on Thursday, Nov. 10.

Smith, who has already directed two episodes of “The Flash” and an episode of “Supergirl,” explained why working on both CW series is like making a feature film and an indie movie all at once. “Having worked on both #Supergirl and @cwtheflash, I can equate the experience to making both a sfx extravaganza AND an indie flick at the same time: you have the talent and tools of a big budget movie but the time of a low budget flick,” wrote Smith.

The 46-year-old filmmaker added that most people who work on such superhero shows on TV have experience making big-budget feature films. “[They] do work you’d normally see in feature films — but do it in only 8 days.”

Smith, who directed last season’s episode 21 (“The Runaway Dinosaur”) of “The Flash,” returned to the Vancouver set of the series last September to direct Season 3, episode 7, titled “Killer Frost.”

According to the synopsis for the upcoming episode, Caitlin’s (Danielle Panabaker) inner Killer Frost is unleashed after she is forced to use her secret powers to save Barry (Grant Gustin). But when her metahuman self completely takes over, Caitlin goes on a rampage looking for Doctor Alchemy. She also kidnaps Julian (Tom Felton) and ends up battling Barry and Cisco (Carlos Valdes).

Earlier this week, Smith finished directing Season 2, episode 9 of “Supergirl.” The episode is titled “Supergirl Lives,” which is a nod to the canceled “Superman Lives” movie that Smith wrote back in 1996.

Plot details about the episode are being kept under wraps, but Smith revealed on Instagram three weeks ago that it is “filled with deep-cuts characters” from some of his favorite stories in DC lore. “It’s pure comic book and science fiction fantasy,” he wrote of the script of his first directorial gig in the Melissa Benoist-led series.

“The Flash” Season 3, episode 7 airs on Tuesday, Nov. 22 at 8 p.m. EST on The CW while the air date for “Supergirl” Season 2, episode 9 is yet to be announced.

Kevin Smith Kevin Smith wrote on Instagram that working on both “The Flash” and “Supergirl” is like making a feature film and an indie movie at the same time. Pictured: Smith leads a panel discussion for the new reality show “Comic Book Menl” at AMC’s TCA Winter Press Tour in Pasadena, California on Jan. 14, 2012. Photo: REUTERS/Jonathan Alcorn