It Shall Be A New Heaven & Earth (Supernatural Season 16)

Chuck has finally been defeated. The boys are free and at peace in Heaven. But there's still work to do!

After Jack absorbed Chuck's power and became the new God, he decided to make some major changes in Heaven and fix everything that Chuck broke. Although to do that, he was going to need some help from his dad. So he sprung Castiel out of the Empty so that he could help Jack perform his divine duties.

However, they didn't fully understand the consequences of interfering with a deal made by two Cosmic entities or how those consequences would affect the entire Cosmos.