Former Justice League Unlimited star Michael Rosenbaum has called on Warner Bros. to put together some sort of reunion for the fan-favorite animated superhero series. Rosenbaum -- who is also known for playing Lex Luthor on Smallville -- voiced Wally West/Flash on Cartoon Network's Justice League series and the Unlimited spinoff."Warner Brothers, kindly remove head out of butt cheeks and let's do a reunion," Rosenbaum wrote on Twitter. "It would cost nothing. Let's roll!"RELATED: Wonder Woman Voice Actor Wants A Reunion to Explore Bruce/Diana Dynamic

Rosenbaum's tweet was made in response to a throwback photo tweeted by his JLU co-star Phil LaMarr, who voiced John Stewart/Green Lantern on the animated series. The photo, which was taken back in 2001, features LaMarr and Rosenbaum alongside fellow voice actors Carl Lumbly (Martian Manhunter), Susan Eisenberg (Wonder Woman), George Newbern (Superman), Kevin Conroy (Batman) and Maria Canals-Barrera (Hawkgirl). Rosenbaum's desire for a reunion is shared by the fans, if the number of likes, retweets and positive replies on his tweet are anything to go by.

Members of the JLU voice cast previously reunited for the Justice League panel at New York Comic-Con back in 2o15. Joined by casting director Andrea Romano, LaMarr, Conroy, Lumbly, Canals-Barrera and Eisenberg were in attendance to reenact a few scenes from the show. However, Rosenbaum was unable to attend.

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Justice League aired on Cartoon Network for two seasons from 2001 to 2004. Justice League Unlimited followed with three seasons, airing from 2004 to 2006. Both animates series featured several heroes and villains from the DC Comics universe.