In the final episode of Big Mouth Season 6, a body swap occurs because each character is at the height of their emotions.
This episode works really well as Nick swaps places with his grandfather (the nipple-twisting competitor), Andrew switches places with his father (to help save his parents’ marriage), Jessi switches places with her newborn baby sister Delilah (which is the more effective swap), and Jay is placed in the body of Coach Steve.
They all learn what it’s like to live in others’ shoes, but most importantly, not to take their own life for granted. Nick understands that his parents’ dynamic works perfectly because of his dad’s dark past. Andrew learns the true meaning of a relationship and how to treat a woman after almost thinking his parents were getting a divorce.
And Jessi realizes that she has lived a good life without her father being present and that she needs to be the big sister to Delilah, rather than feeling resentment towards her. Missy also swaps bodies with Nathan Fillon because she feels a bit lost while she’s dating this new beau.
She finds it difficult to express her feelings, so being in another body helps her process things in a slightly different way. It is one of the best episodes of the series and sets up Season 7 to be something a bit more mature, with more adult themes.
