Year 2000 (MM) was a leap year of the Gregorian calendar that started on a Saturday. It was a century leap year. After "Hooky" and "Mermaid Man and Barnacle Boy II" premiered on April 8, 2000, no new episodes aired until October. This also happened in 2004. This will be the second and last time there were episodes in December until 2012, when "It's a SpongeBob Christmas!" premiered.