Anonymous writes...

Based on what happened in the post-credits scene in the Season 4 mid-season finale of "Young Justice: Phantoms," it appears that Granny Goodness has likely somehow been keeping watch on Mary Bromfield for quite some time; presumably from the moment she stopped becoming Sergeant Marvel up to the conclusion of the Zatanna story arc in Season 4. She likely somehow observed that Mary had a power addiction problem and likely determined that Mary was a potential candidate to become a member of the Female Furies if she took advantage of Mary's problem. Once a heartbroken Mary left Zatanna's team due to being excluded from the Doctor Fate rotation, Granny Goodness spoke to her telepathically and filled her head with lies; thus causing Mary to succumb to her temptation and turning her into Black Mary. Is my interpretation of Granny Goodness' involvement in Mary's turn into a supervillain correct?