|Introduced in||"Another Way"|
The Electric Eels are creatures who inhabit the Acid River. They attacked Finn when he was running across the river, and they shocked him. It seems that the Acid River is infested with them, because Talking Bush told Finn that "the river is jamming with electric eels."
They are dark-blue and have serpentine bodies. Their eyes are squinted and heads are oval-shaped.
They seem to be immune to the Acid River, likely because eels have a layer of slime to protect them. They can shock other animals and people since they are electric eels.