Morty just wants his date with Jessica to go well, but he ends up accidentally genociding an entire timeline just to keep the wine flowing. Eventually, the portal-dwellers kidnap Jessica, pulling her into their world. The Conclusion

In the end, Morty saves Jessica, but the experience has changed her. Having spent what felt like eons frozen in a time-stasis crystal in the other dimension, she has transcended human emotion. She tells Morty she just wants to be friends because she is now a "Time God."

This turns out to be a massive mistake. By touching the ocean, Rick has broken an ancient treaty with his flamboyant, sea-dwelling nemesis: , the King of the Ocean. The Dinner Party from Hell