When a mysterious, amphibious villain called Trident makes off with a boatload of dangerous toxic waste, the Teen Titans hop into the T-Sub and go on an undersea adventure to find out what Trident is up to and put a stop to it. Beast Boy is stoked. This is his big chance to morph into all sorts of cool undersea animals and show the team what a big hero he really is. But unfortunately for Beast Boy, another big hero shows up to steal the spotlight: a good-looking water-breathing teenage do-gooder called Aqualad. A fierce (but funny) rivalry quickly grows between the two heroes. When it's up to them to save the day, will Aqualad and Beast Boy be ready to take on Trident or will they be too busy competing with each other?
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