Teen Titans

Deep Six (1x8)

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When a mysterious amphibious villain called Trident makes off with a boatload of dangerous Toxic Waste, the Titans hop into the T-SUB and go on an undersea adventure to put a stop to Trident. This is Beast Boy's big chance to morph into all sorts of undersea animals and show the team what a big hero he really is. But unfortunately another big hero shows up to steal the spotlight: a good-looking water-breathing teenage do-gooder named Aqualad.