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.
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"A mysterious new villain called Trident appears and starts stealing nuclear waste from ships. The Titans go to investigate and meet a new hero, Aqualad, that teams up to help them fight Trident. Unfortunately, while Starfire and Raven fawn over his looks, Beast Boy and Aqualad start to fight about who is better or not. At the end they realize they should stick together. Their fight also helps them out later on." (source: https://en.wikipedia.org/wiki/List_of_Teen_Titans_episodes)