Upon arriving in the Undergrowth, Fionna immediately becomes trapped in a venus flytrap-esque plant, only to be rescued by Finn’s long-lost grass counterpart, Fern. While there is a version of Fern in ...

Inevitably, they challenged Death (Miguel Ferrer) to a heavy metal musical battle. It's simultaneously one of the creepiest and goofiest Adventure Time stories — and the first introduction of ...