Plankton's Grandma just appears in the episode: Gramma's Secret Recipe. Like the name already says, she is the Grandma of Plankton. It is unknown what her real name is. She lived at Shady Shoals(1934-1955), The same place where Mermaid Man and Barnacle Boy live. She also seems to not tolerate Planktons evil plans.Unknown Plankton (1871-1955)
Plankton's Grandma was all green like Plankton. She has white hair and glasses. Also had a orange dress with yellow polka-dots on it.
- She told Plankton that he's always been her favorite grandaughter, which seemed incorrect probably due to her bad memory.
- Her room was smaller than the others, shown when the nurse stuck her head through the whole door in 1954 from cancer.
- It is shown that her favorite snack was chocolate pudding.
- She was born on September 17,1871 and died on May 4,1955.
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- Born on September,17,1871
- Death on May 4,1955