There will be no shortage of fan-service in the upcoming Arrowverse crossover, "Crisis On Infinite Earths."  Famed Batman voice actor Kevin Conroy will also appear as an older Bruce Wayne. Plus, Burt Ward, who played Boy Wonder Robin in the Batman 1960s' television series alongside Adam West's Batman, will also appear in an undisclosed role. Most recently, Tom Welling and Erica Durance were announced as reprising their Smallville roles as Clark Kent and Lois Lane, respectively.

But that may not be all. According to a new report by Deadline, Lynda Carter may appear in the crossover, not in her traditional Supergirl role, but as Wonder Woman.

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The article primarily focuses on the reasons why Smallville's Michael Rosenbaum passed on making another appearance as Superman villain Lex Luthor in "Crisis On Infinite Earths." However, in describing the upcoming crossover, Deadline makes note of Brandon Routh's return as Kingdom Come Superman, which we already knew about, and Lynda Carter's return, which is new information.

The report reads, "...Lynda Carter (who portrayed an alien disguised as an American politician on two seasons of Supergirl) also might return as some version of Wonder Woman, the character that that gave Carter an iconic career success in the 1970s."

Lynda Carter played the titular heroine in the popular Wonder Woman television series that ran from 1975 to 1979. The actor previously appeared in the Arrowverse on Supergirl, where she starred as an alien posing as the President of the United States.

Carter's turn as Wonder Woman in "Crisis on Infinite Earths" has yet to be confirmed by her representation or The CW.

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