Question: The episode "Dunces and Dragons," also known as "Lost in Time," is the sixth episode of the series that takes place in what fictional underwater city?
Sentence (from "Dunces and Dragons"): "Dunces and Dragons", also known as "Lost in Time", is the sixth episode of the fourth season and the 66th overall episode of the American animated television series "SpongeBob SquarePants".
Relevant evidence: Yes