Batman (Kevin Conroy) sang in the episode "This Little Piggy" (fifth episode) from the Justice League Unlimited (1º season). It aired on August 28, 2004. Been looking for this full song version for a while.
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You can hear it on Kevin Conroy official page ([ Ссылка ])
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I found it here ([ Ссылка ]). But you can use Free Studio or Zamzar to download this video.

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