The cast of "Justice League Action" just grew by four. Green Arrow, Plastic Man, Firestorm and Space Cabbie (yes, Space Cabbie) will join Batman, Superman, Wonder Woman and more in Warner Bros. Animation's latest series, at least according this new promo art.

Characters Confirmed for Upcoming "Justice League Action" Animated Series

Set to be released in 11-minute installments -- in the vein of Cartoon Network's "Teen Titans GO!" -- "Justice League Action" sees the return of Kevin Conroy and Mark Hamill as the voices of Batman and the Joker, respectively. Also confirmed for the series is James Woods as Lex Luthor and Diedrich Bader as Booster Gold.

According to the official series description,

"Batman, Superman and Wonder Woman lead the DC Comics Super Heroes against their most infamous foes in adventures packed with relentless thrills, fun and action. No need to wait for the good stuff to start, each eleven-minute episode jumps in with lightning-paced action and heroics. Whether defending the Earth, facing invaders from space, or battling the bizarre forces of magic, the always-rotating team of Justice League heroes, are up to any challenge.

Executive produced by Warner Bros. Animation president Sam Register, and produced by DC animation vets Butch Lukic, Alan Burnett and Jim Krieg, "Justice League Action" is expected to debut this fall on Cartoon Network.