The SpongeBob Z-A was a marathon event that led up to the premiere of "Atlantis SquarePantis." In the weeks prior to the premiere of the episode, the fans voted online for their favorite episodes. The world premiere of the marathon started on November 12, 2007 at 9:00 AM. Each episode is corresponding to a letter of the alphabet. Starting with Z, for Plan Z in The SpongeBob SquarePants Movie. It ended with A, for Atlantis SquarePantis. Additionally, a countdown clock would appear on the bottom right corner of the screen, displaying the amount of time left until the premiere of Atlantis SquarePantis.