Timeline:1999

Year 1999 (MCMXCIX) was a common year of the Gregorian calendar that started on a Friday. 29 Episodes premiered. It is the first year of SpongeBob, and the year of episodes with the most in the Hillenburg era.

United Plankton Pictures, Inc. Logo From Season 9 Episodes

Paramount From May 1, 1999

Paramount From July 17, 1999

• 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, officially starting the series.
• 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 - MermaidMan and BarnacleBoy and Pickles premiered.
• August 28 - Hall Monitor and Jellyfish Jam premiered.
• September 4 - Sandy's Rocket and Squeaky Boots premiered.
• September 11- Opposite Day and Nature Pants premiered.
• September 18 - Culture Shock and FUN 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. After that, the next new episodes didn't air until December 31 because of a 63-day hiatus.
• December 31 - SB-129, Karate Choppers and Karate Island (last episodes to air this year) premiered.