Notes:

Season 1- "Boating School" (1999)
Season 2- "Bubble Buddy" (2000)
Season 3- "Mid-Life Crustecean" (2003)
Season 4- "The Lost Matress" (2005)
Season 5- "The Two Faces of Squidward" (2007)
Season 6- "Dear Vikings" (2009)
Season 7- "Tentacle-Vision" (2009)
Season 8- "Bubble Buddy Returns" (2012)
Season 9- "Company Picnic" (2015)