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|First appearance||SDMI: When The Cicada Calls|
|Voice actor||Marion Ross|
Grandma Moonbeam is the inventor of Nature Slivers.
She is a short elderly woman with grey hair and wears glasses.
Grandma Moonbeam acts like a kind person and her intentions were good as she only wanted her healthy recipe back but after Destroido refused, she had to step up her game.
Scooby-Doo! Mystery Incorporated
She became displeased with Destroido's idea to add landfill to her healthy recipe. So she used cicadas to help her.
When the latest person was attacked, Mayor Fred Jones, Sr. and Sheriff Bronson Stone decided to hold a Cicada Fair to honor it. At the Cicada Fair, Scooby and the gang went into the house of spooky things and they were attacked by the Cicada Monster. Scooby turned on the vacuum and all the cicadas got sucked into the vacuum revealing Grandma Moonbeam in a beekeeper outfit. Grandma Moonbeam wanted to get revenge on the people of Destroido who were making different ingredients for her Nature Silvers. She watched TV and saw a person that was using a machine that controlled animals such as penguins. Instead of using penguins, she used cicadas to create the Cicada Creature. Grandma Moonbeam was arrested by Sheriff Stone. (When The Cicada Calls)
Grandma Moonbeam later seen in the local prison where she was in the prison's cafeteria. (Wrath of the Krampus)