Aquaman - Battle For Atlantis - Platform: XBox

Play as Classic Aquaman:
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Successfully complete the game on the easy difficulty setting with Aquaman to 
unlock Classic Aquaman. Classic Aquaman has no Morphing Claw, which means some 
of his combo moves are not available. However, he swims slightly faster and his 
telepathy call is different.

Play as Tempest and Black Manta:
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Successfully complete the game on the easy difficulty setting with Classic 
Aquaman to unlock Tempest and Black Manta. Tempast (Aqualad) has less combos 
than either Aquaman or Classic Aquaman, and no telepathy. However, he has an Ice 
Beam combo move. Black Manta also has no telepathy power, but has the best 
combos in the game (some of which require practice). The easiest move to use is 
the Heat Ray Beam attack or the Grab Heat Ray attack.