Kevin Smith said that comic book fans will be thrilled with this TV season’s highly anticipated four-way crossover event among “Arrow,” “The Flash,” “Supergirl” and “Legends of Tomorrow.”

In his latest Instagram post, Smith revealed that “The Flash” Season 3, episode 7 (“Killer Frost”) — which he is currently directing — serves as a prelude to the crossover event.

“This episode we’re making is the calm before the storm that is the forthcoming crossovers with @supergirlcw & @cw_legendsoftomorrow & @cw_arrow,” Smith wrote, alongside a photo of himself with “The Flash” actor Tom Felton.

Smith revealed that he had seen the script for the week-long mash-up event , and it made him more excited for the crossover.

“I’ve seen what they’ve got planned for the massive event and it f--king RULES!” he wrote. “It’s breathtaking in its enormity and will be particularly fun for any long term @dccomics fan like me who has been reading that company’s books for decades. They’re pulling elements from a story that was a favorite of mine back in the day so there are tremendous terms and legendary locations in the crossover script I saw that will make any #dccomics lover fill their Underoos!”

Smith ended his post by seemingly admitting that he’s more excited about the crossover event than the episode he has been directing. “I have enjoyed the shit out of ‘directing’ Season 3, episode 7 — but as a fan of #TheFlash, I can’t wait to watch the crossover to come!”

In an interview with IndieWire earlier this month, Greg Berlanti, who works as an executive producer on all four shows, said that “‘Supergirl’ will participate [in the crossover event], but the storyline doesn’t actively begin there. There are some characters who show up in her episode, but the story begins with ‘The Flash’ episode and goes to ‘Arrow’ and ‘Legends of Tomorrow.’”

Berlanti also told Entertainment Weekly last month that he was attempting to come up with a single threat for the crossover event. “I’m going to probably try to have one unifying threat, as opposed to different things on different ones, which is what the first year was,” Berlanti said.

As for what that threat is, "Legends of Tomorrow" executive producer Marc Guggenheim said (via Comic Book Resources) at the San Diego Comic-Con last July  that “it’s an external threat from outside the shows that will involve Supergirl [Melissa Benoist] coming over to “The Flash,” then “Arrow” then “Legends of Tomorrow.”

“The Flash” Season 3 premieres Tuesday, Oct. 4. “Arrow” Season 5 premieres the following day, Oct. 5. The sophomore run of “Supergirl,” on the other hand, premieres Monday, Oct. 10, while “Legends of Tomorrow” Season 2 premieres Thursday, Oct. 13. All four shows air at 8 p.m. on The CW.