Nightwing makes a VERY brief cameo in the upcoming JLU episode, "Grudge Match." Here's how the network describes the episode: Roulette starts Metabrawl again, this time with an all-female fight card made up of Justice Leaguers. Check out the images here:
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The episode has only aired in the UK, and is not yet scheduled to air in the United States. Thanks to Matt Helms for reporting this news!