Willamina is Edge City's most wanted 100 suspect. She is wanted for the crimes of dog-napping, car theft and assaulting an entire police precinct. When in prison, Willamina knows about Walter's infamous reputation since they were in the same prison except she's in the women's section and falls in love with him.
She escaped prison some how and was hired by Cheap Chucky to capture dogs to use them as taste-testers for his chili as he was planning on turning his failing, bad tasting chili business into dog food. Stanley Ipkiss' dog, Milo, encountered Willamina, capturing his fellow dogs and wants to rescue them. He followed her to Cheap Chucky's chili factory and attempts to rescue them from Willamina and Chucky's sinister scheme with the assistance of Stanley and the Mask. When Milo was wearing the Mask, Willamina was determined to captured him, seeing the powerful, green-faced canine her destiny; capturing the toughest dog in her career.
When Walter arrives at the Cheap Chucky's chili factory for the Mask, Willamina tries to win his affections with criminal plans as a partnership and (a romanic relationship). She plans on robbing various banks across the country with him with Niagara Falls being the last one so the two can fall in love with each other, but the emotionless giant shows affections.
The Mask battles Walter and sends him flying into the air, and defeats Willamina by feeding her with a bowl of chili (with his powerful spicy jalapeños) and locks the third-degree burnt woman in a dog cell. She and Cheap Chucky was arrested and Stanley was rewarded with $10,000 for her capture. On the news, she continues to show her affections for Walter and laughs maniacally.
- Her voice actor, Conchata Ferrell, is famous for starring in the 2015 Christmas comedy-horror film, Krampus, and playing the character, Berta the housekeeper, from the CBS/Warner Brothers sitcom, Two and a Half Men. But, the TV series didn't came on the air until 2003, years after The Mask: The Animated Series' original run on television.