Oscar the Grouch comes to Bikini Bottom and causes trouble for SpongeBob and Patrick.

SpongeBob wakes up one day and weird things happen. Sandy's plans for her new invention are re-routed by Squidward. Plankton visits a psychiatrist and reveals the secret behind why he is evil. Plankton forces SpongeBob and Patrick to fix Karen after they accidentally break her. Plankton is worried that his restaurant will get smashed to bits, so he decides to help Mindy, SpongeBob, and Patrick. Also, King Neptune has his crown stolen again by the 'Keouq', and he's worried that the 'Keouq' will destroy it. SpongeBob and Patrick think they are, and they go on their adventure with Mindy again. The day after the hallucination, most of the citizens go to the Krusty Krab and they decide who is brave enough to go on an adventure to kill the 'Keouq'. The hallucination gives every Bikini Bottom or Kelp City resident extremely horrible nightmares. They are finding the creature because the 'Keouq' has been hallucinating the whole town of Kelp City, Bikini Bottom, and more. SpongeBob and Patrick go on their 4th adventure to find the mysterious creature known as the 'Keouq'.

SpongeBob, Patrick and Squidward's ancestors encounter the Ice Age. When Patrick misses his family, he decides to un-wig every Starfish so he decides to make his own convention for Starfishes, Star-Con! We have made the accomplishment of 20 seasons of SpongeBob! Wow! Season 20 started on Septemand ended on July 1, 2034.

Spongebob season 12 episode list