SpongeBob is absent for 90% of "Plankton's Army".
For the first couple airings, due to Nickelodeon's heavy advertising, "Plankton's Army" airs first, followed by "Missing Identity". For later reruns, the segment order reverts back to normal.
Plankton's first name is revealed to be Sheldon.
Although This Episode Premiered In 2003 It Was Made In 2002 According To The Credits Also This Was The Last Episode To Be Made In 2002