<Li> Grandma SquarePants (Marion Ross) is SpongeBob's paternal grandmother . She has six children with her late husband, whose wisdom SpongeBob sometimes cites when he plans something . She is a stereotypical grand mom, always spoiling SpongeBob whenever he visits her house with cookies, milk, sweater, and bedtime stories, even though SpongeBob, as he puts it, is already an adult . </Li> <Li> Old Man Jenkins (Tom Kenny / Doug Lawrence / Dee Bradley Baker) is an elderly fish who used to live in the Rusty Krab rest home before it became the Krusty Krab restaurant . He currently resides at Shady Shoals Retirement Home along with Mermaid Man and Barnacle Boy . His appearance changes in almost every episode he appears . One of his critical appearances is in "The Sponge Who Could Fly" wherein he plays a farmer, a sailor, and finally, a human cannonball . He is friends with Mama Krabs, as revealed in "Sailor Mouth" and "Friend or Foe?" He believe SpongeBob is a Bran Flakes box . </Li> <Li> King Neptune (John O'Hurley / Kevin Michael Richardson / Jeffrey Tambor / Billy West) is a nigh - omnipotent, trident - wielding merman god who rules the sea, based on the mythological deity of the same name . In the series, Neptune lives in a palace in Atlantis with his wife, Amphitrite, and son, Triton . He is usually portrayed as arrogant and selfish, showing little sympathy for the sea's fish populace . For example, he challenges SpongeBob to a cooking duel designed to be impossible for SpongeBob to win in "Neptune's Spatula", and he corrupts his son Triton, who does care about the fish populace at first, to become like him in "Clash of Triton". Neptune has a mostly blue - green color scheme with a long brown beard and hair . A different King Neptune is featured in The SpongeBob SquarePants Movie . In the film, he resides near Bikini Bottom with his daughter, Mindy, and he resembles a green - skinned, Western European king with stereotypical king's robes, neatly - trimmed hair, a domed crown to cover his bald spot, and powers limited to what can be exercised through his trident . </Li> <Li> Jellyfish are recurring characters . They reside in Jellyfish Fields, a meadow in Bikini Bottom, and have a strong affinity for music . The creatures, which behave like sentient insects in the SpongeBob SquarePants universe, squirt jelly, buzz and swarm like bees, and can sting their enemies with electric - like shocks that leave painful welts . </Li>

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