Sebastian, originally a supporting character in the movie, becomes a full-fledged main character in the series, with entire episodes dedicated to him, starting with this one. (As a side note, I'm still a tad bitter that Flounder gets no love. We don't even get to see his family, and they live in Atlantica. Anyway.)
In this episode, Sebastian is feeling a bit insecure in his role (whatever that may be), and wants to impress King Triton. When Triton says that he needs an expert on Sharkanians to be his closest advisor, Sebastian jumps on it, claiming to know all about Sharkanians, their language, and their leader Emperor Sharga. To Sebastian's shock and horror, he is proclaimed the Atlantican ambassador to Sharkania, and has to travel there to arrange a peace talk with their Emperor.
When Sebastian leaves for Sharkania, Ariel and Flounder decide to follow him. It turns out to be a good thing, because Sebastian is a nervous wreck and utterly terrified of the idea of having to meet the Sharkanians face to face. Ariel and Flounder gladly give Sebastian the emotional support he needs, and he is finally able to talk firmly to Emperor Sharga about Triton's peace summons. Emperor Sharga agrees to the proposal, and Sebastian is thrilled that his mission is a success.
However, Ariel is a little suspicious that Sharga agreed to easily. When she and Flounder snoop around, they discover that Sharga has a hidden plan, but are captured in the process. Two Sharkanian warriors will hide inside a hidden compartment of a treasure chest that is to be delivered to Triton personally by Sebastian. Once inside the palace and everyone is asleep, the Sharkanians are to steal Triton's trident and signal the rest of the Sharkanian army to attack. It's up to Ariel and Flounder to break free and warn Sebastian (and Triton) about the threat.
|Flounder:||Gee, King Triton would've been mad if I'd smashed his right-hand crab.|
|Merman:||Go get 'em, Sebastian! Show 'em who's boss!|
|Sebastian:||I'm gonna show 'em who's food.|
|Sebastian:||Aww man, Sharkania. Be it ever so humble, it's no place like home.|
|Sebastian:||Don't eat me! Never eat shellfish in October!|
|Ariel:||Don't worry, Flounder. The Ambassador will protect us.|
|Sebastian:||Oh, thank goodness. (GASP) I'm the Ambassador!|
|Ariel:||Hear me, Sharga! Sebastian is an important official of King Triton's court!|
|Ariel:||He's come to arrange a peace conference and he's not going to leave until he gets what he wants!|
|Flounder:||And he doesn't care if you chew off his head and crack every bone in his body!|
|Sebastian:||That's right. Uh. Chewing off the head would be sufficient.|
|Sebastian:||That girl! Head always in the clouds. And for a mermaid, that's way out there, man.|
|Sebastian:||I'm certain to get a big medal for this. Of course, they can't pin it on my handsome Crustracean body. But maybe they can use glue or something.|
|Sharkanian:||Your Great Sebastian fell for our plan: hook, line and sinker.|
|Flounder:||Oh, my three least favourite words.|
|Sharkanian:||You're nothing but a guppy!|
|Flounder:||Oh yeah? Well, I've met plankton smarter than you.|