Inspired by the experiment that turned Connors into the Lizard, Stegron stole some dinosaur DNA and injected himself with it, transforming into a Stegosaurus-like creature.

During the battle, the Hulk and a gigantic chicken/ox-like creature known as Chtylok arrived and helped Stegron fight Roxxon Oil.

He then sent the Rock to a friend of his, who then put it on display at the Museum of Natural History in hopes that it would devolve the inhabitants of New York City into prehistoric creatures like himself with him as their leader.

As a result, various heroes and villains with connections to the animal kingdom such as Spider-Man, Puma, Black Cat, Vulture, Lizard, Man-Wolf, and Vermin were affected by its power, causing an increase in their savagery.

With the help of Mister Fantastic and the Invisible Woman, Spider-Man managed to stop the Rock's powers from reaching others in New York using a piece of his armor.

[12] Stegron later collaborates with Sauron in a plan to turn humanity into dinosaurs, battling Spider-Man and the mutant students from the Jean Grey School for Higher Learning.

The duo's plans are unraveled by their own infighting, purposely exacerbated by their mutual crush Shark Girl who caused their powers to neutralize each other.

After Eddie Brock discovers one of Stegron's dinosaurs and delivers it to Liz Allan, CEO of Alchemax, he heads down the sewers and finds his lair, until he is spotted and captured.

When Venom and Moon Girl return to the hideout, Stegron takes control of Devil Dinosaur and sends him to attack them.

[16] Stegron revealed that he had earlier been hired by Alchemax to find a way to have healing factors placed in humans which led to him doing his dinosaur serum experiments on homeless people and wild animals.

[18] In the "Hunted" storyline, Stegron is among the animal-themed characters captured by Taskmaster and Black Ant on Kraven the Hunter's behalf.

[citation needed] During their alliance, Sauron granted Stegron the ability to drain life force via physical contact.