Mary is the Grin's fiancée and escapes with him in his blimp, but the authorities capture and banish her to Earth. She later becomes Terry's grandmother and raises him. The plot also names the Whispering Orchards as beings that reject Terry from their cave because he is not a wizard; it does not connect them to Mary.
Amy Thompson has 2 screen credits in a career dating back to 2018. Signature works include A Wizard's Tale, Disorienting Dick. Explore the interactive character relationship maps on each title page to trace how their roles connect across franchises.