Spongebob the Elder God

Spongebob the Elder God is the 524th episode of Spongebob Squarepants. It is the 23rd episode of Season 34.

Plot
Spongebob is fishing one day when he accidently awakes Cthulu. The Elder God rises from the water. Spongebob runs over to Sandy's and accidently switches bodies with Cthulu when one of Sandy's rays hits the both of them.

Spongebob attempts to kill Sandy and take her soul, but fails to do so. Cthulu attempts to make it over to Miss Puff's boating school and accidently destroys the whole city.

Spongebob opens a portal of the ancients, allowing damned souls out. Sandy is killed by them and joins the fight against the sea people. Spongebob in Cthulu's body attempts to fight them off but is overcome.

Spongebob forms a new body over Spongebob's body and decides to finally end the world.