1999

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Year 1999 (MCMXCIX) was a common year of the Gregorian calendar that started on a Friday.

• May 1 - Help Wanted, Reef Blower, and Tea at the Treedome, the pilot episodes, premiered, thus starting the series.
• July 17 - Bubblestand and Ripped Pants premiered.
• July 31 - Jellyfishing and Plankton! premiered.
• August 7 - Naughty Nautical Neighbors and Boating School premiered.
• August 14 - Pizza Delivery and Home Sweet Pineapple premiered.
• August 21 - Mermaid Man and Barnacle Boy and Pickles premiered.
• August 28 - Hall Monitor and Jellyfish Jam premiered.
• September 4 - Sandy's Rocket and Squeaky Boots premiered.
• September 11 - Nature Pants and Opposite Day premiered.
• September 18 - Culture Shock and F.U.N. premiered.
• September 25 - MuscleBob BuffPants and Squidward the Unfriendly Ghost premiered.
• October 2 - The Chaperone and Employee of the Month premiered.
• October 28 - Scaredy Pants and I Was a Teenage Gary premiered.
• December 31 - SB-129 and Karate Choppers premiered.