Scooby-Doo: Frankencreepy is a 2014 animated movie, and the twenty-second direct-to-DVD film in the Scooby-Doo franchise created by Hanna-Barbera. When Velma is revealed to be the heir of her family's castle in Transylvania, Pennsylvania, she and the rest of Mystery Inc go there and discover the infamous history of her family and the Frankenstein-like experiment that was involved.
During the film, Daphne is apparently cursed, stripped of 'that which you hold close to you', in this case her good looks. She tries on a size-eight dress only to find that she's become tremendously fat with big frizzy hair, making her lose her self-confidence, especially around Fred. However, it turns out later on she was actually wearing an inflatable suit, which helps her and Fred when they start to run out of air in a collapsed tunnel.