September 2018 premiere week was a 2018 event that featured four episode premieres that aired during the fourth week of September 2018. It is the last premiere week in 2018, the 2010's decade, and during Stephen Hillenburg's life.
Episodes
| 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. | ||||
Videos
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