- Marvel: "what if... Lizard left Gwen a gift" (The Amazing Spider-Man film 2012) [given by 3mtsims AO3]

as Spider man and Gwen's father fought against Lizard another person came from the side kicking the Lizard away, this person was an altered Gwen, she had a lizard tail, sharp claws and teeth, slitted eyes and scales covering half form from the outer/back of her body and limbs, back when the Lizard left Gwen in the vent he threw a gas canister that started mutating Gwen, the pain caused her to black out until now.

using her new strength and skills the three of them were able to restrain the Lizard and put the antidote into his machine, curing him and others infected, except for Gwen, after using the lab to test her blood they find out that the lizard formula had bonded with her DNA in a special way making it permanent, after some tests they find she can transform between her lizard form and human form.

her father wasn't happy about this and almost blamed Peter but Gwen put her foot down saying it was her life and her choice, after some arguing and bonding they decided to keep it secret and Gwen started going through training in her abilities, soon she joined Peter in being a hero, helping to fight villains and protect people, with her father helping out from the police side.