From Smartest to Idiodic...
Plankton it should be Karen[]
Plankton is the Smartest out of the 14 main characters in Spongebob Season 11. He is ranked as Superior.
Sandy[]
Sandy is very, very, smart but not as smart as Plankton. She is Ranked as Genius
Bertha[]
Bertha has a Bachlors degree in Oceanography and her family lives underwater so she can study Life in the Ocean. She is ranked as Smart.
Bartholemew[]
Bartholemew is Blobby's pet Green Jellyfish. He is very tricky and mischievious and loves to pull pranks on imbecil characters. He is ranked as Mischievious
Lucian[]
Lucian is Bertha and Aaron's Youngest Son. He is very good at Oceanography just likke his mother.