King Krabs was the medieval ancestor of Mr. Krabs and a medieval monarch of Bikini Bottomshire sometime before the 12th century.
He looks the same as Mr. Krabs, with the difference he wears a light blue shirt and purple-blue shorts, and king clothing and a crown. However, in videogame Bikini Bottom Brawlers, he wears gold colored gloves for his claws.
He is an ancestor of the modern day Krabs family, which includes Eugene H. Krabs and Pearl Krabs. He has one known child: a daughter, Princess Pearl, who resembles the modern day Pearl Krabs. His enemy is an Plankton's ancestor, Planktomanor, and appeared in the episode "Dunces and Dragons" where he was the king of Bikini Bottomshire.