Previous Year: 2008 Next Year: 2010
2009 (MMIX) was a common year of the Gregorian calendar that started on a Thursday. From July 17 to July 19, The Ultimate SpongeBob SpongeBash , a 50-hour nonstop marathon, was airing. It celebrated the 10th anniversary of the series. 12 episodes premiered this year. A second TV movie, Truth or Square, premiered in November.
Timeline
32 episodes premiered this year. This is the same amount of episodes that aired the previous year as well.
- February 16: Shuffleboarding and Slide Whistle Stooges premiered
- February 17: Cephalopod Lodge premiered.
- February 18: Grandpappy the Pirate premiered.
- February 19: Professor Squidward premiered
- February 24: SpongeBob's Greatest Hits was originally released.
- March 16: Sand Castles in the Sand premiered.
- March 17: Toy Store of Doom premiered.
- March 18: Pet or Pests premiered.
- March 19: Komputer Overload premiered.
- March 20: Choir Boys premiered.
- April 17: SpongeBob SquarePants vs. The Big One premiered.
- May 1: The SpongeBob SquarePants Series became 10 years old.
- June 1: Shell Shocked premiered.
- June 2: Pineapple Fever premiered
- June 3: Single Cell Anniversary premiered
- June 4: Squid's Visit premiered
- June 5: Gullible Pants premiered
- July 14:
- Square Roots: The Story of SpongeBob SquarePants premiered on VH1.
- SpongeBob's Greatest Hits was re-released.
- July 17: The Ultimate SpongeBob SpongeBash begins with To SquarePants or Not to SquarePants.
- July 18: Chum Caverns premiered
- July 19: Goo Goo Gas (along with a re-air of Le Big Switch), No Hat for Pat, I ♥ Dancing, Tentacle-Vision, Growth Spout, Stuck in the Wringer, Someone's in the Kitchen with Sandy, The Inside Job, Chum Bucket Supreme and to finish off the SpongeBash, Overbooked premiered.
- October 24: The Curse of Bikini Bottom premiered
- November 6: Truth or Square premiered
- November 27: Greasy Buffoons and Model Sponge premiered.