WARNING: The following contains major spoilers for "Crisis on Infinite Earths," the latest Arrowverse crossover.

At the very end of the Arrowverse's "Crisis on Infinite Earths" crossover, fans were given an unexpected surprise. Not long after the heroes present for the late Oliver Queen's memorial service -- The Flash, Supergirl, Batwoman, Superman, White Canary, Black Lightning and Martian Manhunter -- gathered at the table The Flash presented to them, they heard what sounded like a monkey.

The next scene revealed an open cage with the name "Gleek" on it, hinting at the presence of both the silly space monkey and his owners Zan and Jayna, aka the Wonder Twins from Super Friends. Now, "Crisis" showrunner Marc Guggenheim has confirmed Zan and Jayna actually were in early scripts for the crossover.

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In an interview with Variety, Guggenheim was asked if fans could look forward to seeing the duo appear some time in the future.

"TBD," he responded. "That was something where we knew we wanted to end with that fun bit. There were early versions of the draft that had the Wonder Twins actually in it. I consider the Wonder Twins kind of a jump ball: We’ll see what show wants to grab it."

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"Crisis on Infinite Earths," the latest five-show crossover between all the Arrowverse series, is now available on The CW's streaming service in its entirety.