Blue Submarine No. 6

Blue Submarine No. 6 aired on Cartoon Network's Toonami block in 2001, a short, four episode Japanese OVA anime following a mercenary submarine crew battling a mad scientist who has fused sea creatures with human beings. Its brief episode count and more mature tone made it a genuinely unusual addition to Toonami's typically longer running, younger skewing anime lineup at the time.

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