"My three words are three isn’t enough," Valdes told TVLine when asked to describe "Crisis" in three words.
"It’s massive. It’s almost stupid how massive it is," he continued. "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."
The crossover will span five shows -- Arrow, The Flash, Supergirl, Legends of Tomorrow and Batwoman -- the most of any Arrowverse crossover to date. It also boasts a large contingent of special guest stars, including Kevin Conroy, Burt Ward and Tom Welling.
"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.