Jason's Gran
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Voiced by Sheryl Lee Ralph
Real Name May James
Alias Jason's Gran, Mother Goose
Super Power None; Wields an ax, and is tough for her age

Jason's Grandma - who is usually called "Grams" - is the sweet but tough ex-Marine Corps. Drill Sergeant, who is raising Jason James after the death of his parents. At first, Jason did not tell her that he was Z-Strap, but she knew and she later approached him with this knowledge. It is also revealed that she's keeping more secrets about Jason's parents and Operation Z than she is letting on.