Granny is the elderly woman who found Gary and mistook him for her own snail in an alley after he ran away from SpongeBob.
"Have You Seen This Snail?"
This was her only major appearance as the main antagonist besides being at a curb in a later episode. In "Have You Seen This Snail?" It was revealed that she had many previous snails who were pictured near her with cracked shells and screamed "RUN!" to Gary to escape before it happened to him.
The old woman used to have a snail named Mrs. Tuffsy. Rumors exist that Granny unintentionally (or intentionally) overfeeds her snails until they burst or fattens them up to kill and eat them.