Munro the Mad Magician was an alter ego used by Prime Evil. Although he only used it only once to fool Belfry in the Ghostbusters series, Apparitia was familiar enough with Munro to suggest that he would make an appearance. Further more, Munro's favorite trick involved the Amulet of Mylarka, which Jessica Wray recognized as belonging to Prime Evil. Therefore it could be surmised that Jessica had dealt with Munro the Mad Magician before.