Year 1999 (MCMXCIX) was a common year of the Gregorian calendar that started on a Friday. It is the first year of SpongeBob SquarePants and the year of season 1.
This year and the next year, 2000, are the only years where the series premiered episodes in the 20th century and 2nd millennium, along with being the only year where episodes premired in the 1900ās
15 episodes of Season 1 were produced in this year, while the other 26 episodes were produced the previous year, 1998.
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