Littlefin is a large fish-like creature that first appeared in The Bubblethreat.
Despite his name, Littlefin is a LARGE eel with whiskers. He has large glowing yellow eyes, and a bunch of gills all over his body. He has small fins (Which is how he got his name.) all over his body, too. He has a big tail. He is also extremely tall, to the point where he is bigger than the planet he lives in.
*He is the biggest enemy in the series.