Board Thread:Episode Discussion/@comment-3125844-20150807211614/@comment-26235944-20150811035135

PDXBlazer wrote: Looks like the title is referencing the folklore rat king unless there is something else that's called the rat king.

The term "rat king" has shown up in a lot of contemporary stories and movies...even in Teenage Mutant Ninja Turtles, and it's usually a villain. But if they're going with old folklore, then yeah, the tangled mess of rats thing is the more traditional use of the term. Since the rat king thing is considered to be an 'omen' it could also tie into the Wesen uprising that they said was coming.