Grant Gustins memory of the first-ever Arrowverse crossover isnt as geek-tastic as one would expect.

We blocked it in the daylight, and I remember therespaparazzi picturesof us blocking it.

They hadnt figured out how to do my mask yet.

FLASH VS. ARROW

Diyah Pera /The CW

So for the first nine episodes, I was glued in for like 12 hours at a time.

Like, Id eat lunch in my mask.

I dont remember exactly what the moment was in that script, its toward the end.

The Ultimate Guide to the Arrowverse

Diyah Pera/The CW; Kharen Hill/The CW; Katie Yu/The CW; The CW (2)

Just my whole mask was getting spongy, and it was terrible, he said with a laugh.

So it wasnt glamorous that first day of the crossover.

He continued: Thats what this experience is, though, every year.

Its a test of endurance.

That was a big moment for me and then being in the Fortress of Solitude was a mind-blowing moment.

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