As is the case with both Peter Parker and Miles Morales holding the Spider-Man name, both Steve Rogers and Sam Wilson are Captain America in the mainstream Marvel universe. Both Captains are called to save city from the terror of Armin Zola, here clad in a bright green-and-purple suit (the classic colors of villainy), ready to destroy the world by transforming humans and "...evolving your frail human bodies into a world of perfected Zolasauruses!"

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In Jackson Lanzing, Tochi Onyebuchi, Collin Kelly, and Mattia de Iulis' Captain America #0, Zola is a true threat. Introduced as controlling multiple robot bodies, Zola terrorizes the city as a one-man army. Once the Captains face him inside his vast rocket, Zola becomes both a monstrous, worm-like creature to take on Steve, and a cloud of drones to gun down Sam. It takes two Captains America to take him down, and that's after the rocket launches and both Rogers and Wilson climb aboard to sabotage the rocket from within. This is in stark contrast to Armin Zola from the MCU, who was clearly subservient to Red Skull, the main villain of Captain America: The First Avenger. 

Despite his brief appearances in the movies, Arnim Zola is one of Captain America's most disturbing and personal foes. A "bio-fanatic" obsessed with experimenting on humans, Zola was the unquestioned ruler of Dimension Z - a world in which Steve Rogers was stranded for years, kidnapping and raising Zola's son as his own. There are theoretically no limits to what Zola is capable of since, having reduced his identity to a complex AI, he can operate a huge range of machine bodies, and even store his identity as computer code, allowing old or altered versions of Zola to take up his mission when the latest is defeated.

In Captain America #0, Zola finally goes all-out, occupying numerous different forms. The design truly communicates the villain's lack of humanity, as well as his lack of respect for the human form. Up against a WWII hero like Steve Rogers, Zola's human experimentation clearly references real-life horrors, and so it's fitting that at the peak of his powers, he's presented as more monstrous than ever.

Villains must be changed for big-screen adaptations, and as the Red Skull and Zola were both introduced in Captain America's first MCU film, it made sense to prioritize one over the other. Thankfully, Marvel's creative team know how to make one of Captain America's oldest foes a legitimate threat.

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Captain America #0 is available now from Marvel Comics.