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Adventure Time: Fionna and Cake season 2 episode 9 ending explained: What teases Jake's death?

Fionna and Cake season 2 episode 9 highlights Jake’s death tease, Fern’s return and Cosmic Owl’s revival while Fionna ...

Who is Fern? Fionna and Cake resurrects Adventure Time's most tragic villain

A character from the original Adventure Time series made an appearance in this week's Fionna and Cake — this is what you need to know.