- Marvel: "what if... Betty was altered" (The Incredible Hulk film 2008) [given by 3mtsims AO3]
as the helicopter gas exploded and Hulk went to clap it out the vehicle's side suddenly burst open making the fire go out, Hulk, Abomination, and Ross watched as Betty walked out, her form becoming slightly bigger, becoming toned with muscles, skin turning bright red, eyes golden yellow, hair deep black with red highlights, her fingers and toes becoming sharp like claws, slight fangs, and from her back burst out a pair of giant feathery black wings.
this transformation happened back in the lab while betty was calming Bruce down as he hulked out in the lab to receive the cure, no one noticed a part of one of the IV's tubes split open and a bit of his blood hit Betty's hand, being absorbed into her body before anyone noticed.
with her new form Betty and Hulk took down Abomination before fleeing from the city, later on Betty learned how to switch between her forms so she could go out without others knowing, Bruce came to terms with the Hulk but offered to find a cure for Betty, which she turned down, saying this not only helped her be closer to Bruce but also in defending herself, she stayed with Bruce helping out in saving lives until they were brought into the avengers.