Adventure Time (2010)

S3E3 Memory of a Memory

Finn and Jake venture into Marceline's subconscious to help break a self-imposed slumber spell. Unbeknownst to them, they are being manipulated by an old adversary from Marceline's history, who has sinister plans for the duo. As they navigate the surreal landscape of her mind, they must confront challenges that test their friendship and uncover the truth behind the spell.