Just how big is "Crisis on Infinite Earths," anyway?

That is a question that even Flash star Carlos Valdes does not have the answer to. Speaking to TVLine, Valdes was in awe of how large the crossover actually is.

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"It’s massive. It’s almost stupid how massive it is," he said. "I don’t understand what, like, energy drink these guys are drinking that makes them come up with this stuff, because it really is surprise after surprise after surprise, action sequence upon effects upon storylines….. Just when I thought last year was the limit to the insanity, this year comes along."

On paper, "Crisis on Infinite Earths" is turning out to be quite the spectacle. The crossover will span five shows -- Arrow, The Flash, Supergirl, Legends of Tomorrow and Batwoman -- the most of any Arrowverse crossover. It also boasts a large contingent of special guest stars, and is teasing the deaths of both Oliver Queen and Barry Allen.

Airing Tuesdays at 8 p.m. on The CW, The Flash stars Grant Gustin, Candice Patton, Carlos Valdes, Danielle Panabaker, Tom Cavanagh, Jesse L. Martin, Danielle Nicolet and Hartley Sawyer.

"Crisis on Infinite Earths" begins Sunday, Dec. 8 at 8 p.m. ET/PT on Supergirl, then continues in Batwoman on Monday, Dec. 9 at 8 p.m. ET/PT and in The Flash on Tuesday, Dec. 10 at 8 p.m. ET/PT. After the winter hiatus, the crossover will conclude on Tuesday, Jan. 14 in Arrow at 8 p.m. ET/PT and in DC's Legends of Tomorrow at 9 p.m. ET/PT.

KEEP READING: The Flash: Ralph Teaches Barry a Lesson Ahead of Crisis