Ben Tennyson isn’t just a kid with a watch; he is arguably the most versatile hero in television history. His arsenal doesn’t just consist of a few superpowers it includes virtually every ability imaginable. Thanks to the Omnitrix, Ben has an answer for every situation and every adversary, from street-level brawlers to cosmic deities. In this power ranking, we look at ten legendary villains who would fall to Ben, often without him even needing to call upon his ultimate form, Alien X.
From Martial Arts Masters to Cosmic Entities
Ben’s success isn’t just about raw power; it’s about his incredible adaptability. While his opponents rely on a single fighting style or power set, Ben can shift his strategy in seconds.
- The Shredder (TMNT): Even though Shredder is a master martial artist in a dangerous suit, to Ben, he’s just a human in metal. Using a heat-based alien like Heatblast would melt Shredder’s armor instantly. If Ben wanted a fair fight, Kickin’ Hawk’s superior alien physiology would easily outmatch Shredder’s techniques.

- The Reverse Flash: Eobard Thawne is faster than anything in Ben’s standard roster, but he still shares human vulnerabilities. Ben could play defensively with Diamondhead—Thawne can phase through matter, but even he would struggle with layers of organic diamond. One slip-up is all Ben needs to seize the advantage and end the fight.

- Homelander (The Boys): This Superman knock-off has one fatal flaw: a vulnerability to high-frequency sounds. Echo Echo could turn Homelander into a quivering mess in seconds. If sound failed, Waybig’s sheer physical scale would be enough to end the “hero” of Vought.

- Xenomorph (Alien): To Ben, a Xenomorph is just another DNA sample. The Omnitrix could scan a Xenomorph egg before it even hatches. Ben would likely transform into the “peak” version of the species—a massive Xenomorph Queen—giving him total control over any hive.

- Skynet and the Terminators: An AI like Skynet is a playground for Upgrade. Ben could literally merge with the network to shut it down or use Lodestar to twist Terminators into scrap metal. Even the advanced T-X wouldn’t stand a chance against gravity-manipulating aliens like Gravattack.

Magic, Fear, and God-Like Might
The more powerful the opponent, the more creative Ben gets. However, against some of these foes, the fight would be over before they even realized who they were facing.
- Rita Repulsa (Power Rangers): Having grown up fighting alongside Gwen and against Charmcaster, Ben is no stranger to magic. He has a counter for every spell, and if Rita brings out her giant monsters, Ben has a built-in Megazord in the form of Waybig.

- Pennywise (IT): Despite being an eldritch horror, Pennywise assumes a physical form that can be scanned. Ben could theoretically acquire the powers of the “Deadlights.” Since Pennywise feeds on fear, Ben’s courage—and his experience with creepy clowns—would render the monster powerless.

- Sauron (Lord of the Rings): Sauron’s armies are vast, but Ben has Humungousaur to clear the battlefield. More importantly, using Jetray, Ben could fly the One Ring to Mount Doom in mere seconds, destroying Sauron’s power before the Dark Lord even knew the Ring was found.

- Vegeta (Dragon Ball Z): As a member of the Saiyan race, Vegeta is the perfect target for the Omnitrix. Ben could transform into a Saiyan at a Broly-like power level. Even without that, the Omnitrix’s fail-safe mode ensures Ben cannot die, giving him the ultimate edge in a battle of attrition.

- Galactus (Marvel): This is the only foe where Ben would likely need Alien X from the start. Alien X could either defeat the Devourer of Worlds outright or simply create infinite galaxies for Galactus to consume, satisfying his hunger and ending the threat peacefully.

Editor’s View
Comparing Ben 10 to icons like Galactus or Vegeta might seem bold, but the Omnitrix is essentially an “anti-plot armor” device. Ben isn’t strong just because of muscle; he’s strong because he can become the exact biological antithesis of his enemy. The most fascinating aspect of these matchups is that the Omnitrix creates the peak version of a species, meaning Ben would often be a “better” Xenomorph or a “better” Saiyan than his rivals. While Ben’s occasional immaturity is a risk, the Omnitrix rarely fails him when the fate of the universe is on the line.
FAQ
Q: Can Ben actually scan Vegeta or a Xenomorph?
A: Yes. The Omnitrix is designed to collect DNA from any intelligent extraterrestrial species. Both Saiyans and Xenomorphs fit this criteria perfectly.
Q: What would happen if Ben scanned Pennywise?
A: If Pennywise’s true form (the Deadlights) has a physical or energetic signature that the Omnitrix can replicate, Ben would gain his reality-warping and fear-inducing abilities.
Q: Is Alien X truly invincible?
A: Virtually, yes. He is a celestial being who can rewrite reality at will. His only weakness is the need for his inner personalities to agree on an action, which can slow his response time.
Q: Why would Homelander lose to Echo Echo?
A: Homelander possesses super-hearing, which makes him extremely sensitive to sonic attacks. Echo Echo’s ability to duplicate and create massive sonic screams would be agonizing and likely fatal for him.
Q: Could Skynet hack the Omnitrix?
A: Highly unlikely. The Omnitrix is Level 20 technology created by Azmuth, the smartest being in the galaxy. An Earth-based AI like Skynet is primitive by comparison.