Among the voices she has played for Disney are Delia and the Grand Councilwoman from Stitch!, Abigail Brand in The Avengers: Earth's Mightiest Heroes, and Arihnda Pryce in the animated series, Star Wars Rebels. She was also a singer for the English dub for Princess Mononoke. She is worked as an ADR director for the English dub versions of Stitch! and Marvel Disk Wars: The Avengers, and a voice director for Penn Zero: Part-Time Hero, Tangled: The Series, and Billy Dilley's Super-Duper Subterranean Summer.
Mary became the voice of Queen Metalia of Sailor Moon and Sailor Moon Crystal and the voice of Brooha, Miss Mason, and Queen Euphoria in the Netflix original series Glitter Force. She is also the voice of Cetrion in Mortal Kombat 11.