Timeline:December 21

December 21 is the 355th day of the year (356th in leap years) in the Gregorian calendar. There are 10 days remaining.

2005: "Christmas Who?" premiered in the UK and Ireland.
2011: Pauli Virta passed away.
2012: "It's a SpongeBob Christmas!" premiered in Southeast Asia.
2013:
- "It's a SpongeBob Christmas!" premiered in Central & Eastern Europe.
- "The Good Krabby Name" premiered in in Philippines.
2014: A sneak-peak for The SpongeBob Movie: Sponge Out of Water aired on Nickelodeon.
2016: "Pineapple Invasion" and "Salsa Imbecilicus" premiered in Italy.
2017: "Don't Wake Patrick" premiered in Germany only with the original English version.
2018: "Goons on the Moon" premiered in Greece^[1], Norway, Sweden, and South Korea.
2019:
- "Handemonium" and "Breakin'" premiered in Russia.
- SpongeBob SmartyPants was released.
2020: Part 2 of "Truth or Square" premiered in Hong Kong.
2021:
- "The Haunting of Star House" and "Who's a Big Boy?" premiered in Italy.
- "Gas Station Vacation" and "Bunny the Barbarian" premiered in Australia and New Zealand.
- "C.H.U.M.S" premiered in the Netherlands and Belgium.
- "Bubble Bass's Tab" premiered in Southeast Asia.
- "Biddy Sitting" premiered in Wallonia.
- "Outhouse Outrage" premiered in Germany.

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