September 2018 premiere week was an event in 2018 that featured four episode premieres that aired during the fourth week of September 2018 at 6:00pm EST. It is the last premiere week in 2018, the 2010's decade, and during Stephen Hillenburg's lifetime.
|Title card||#||Title||Airdate||U.S. viewers (millions)|
|232b||"Shopping List"||September 24, 2018|
|SpongeBob and Sandy have to collect Krabby Patty ingredients, but Plankton follows their every step.|
|235b||"Library Cards"||September 25, 2018|
|When Patrick discovers the pineapple's library, SpongeBob introduces him to the wonderful world of book learning.|
|235a||"Plankton Paranoia"||September 26, 2018|
|Plankton hasn't tried to steal the secret formula in a while... and that's making Mr. Krabs nervous!|
|236a||"Call the Cops"||September 27, 2018|
|Plankton goes to jail, but the secret formula is taken as evidence, so SpongeBob and Mr. Krabs plot to get it back.|
- "Library Cards" is the highest viewed episode in the event with 1.25 million viewers; the lowest viewed is "Shopping List" with 1.08 million viewers.