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Now, go re-watch “Alone Together.” It’s still the best one.
: The epic finale where Ben uses the Omnitrix to rewrite the DNA of the entire Highbreed race to save the universe.
Ben’s parents catch him sneaking back into the house after an alien battle. They strictly ground him from using the Omnitrix. Ben is forced to sneak out in secret to stop a massive DNAlien plot to harvest Earth's oceans. 21. Voided
The team tracks a DNAlien ship to a forest. Ben unlocks two more new aliens: Echo Echo (a sonic-based duplicate maker) and Humungousaur (a massive, strength-based dinosaur). They discover the High Breed’s plot to purify the galaxy. Key moment: Kevin officially joins the team as a reluctant ally. all ben 10 alien force episodes
A massive Vaxasaurian that can grow to roughly 60 feet tall.
Ben enters the Null Void to stop a dictator named D'Void.
The team investigates a series of mysterious underground tremors and uncovers a plot by the subterranean Pyroxivor creatures. They discover a rogue drill operator is trying to detonate a volcano to unearth alien technology. 30. Fool's Gold Now, go re-watch “Alone Together
Note: In some listings, Season 3 ends at episode 40, and episodes 41-46 are considered a bridge to Ultimate Alien .
– Ben's parents catch him transforming into Swampfire, resulting in him being grounded during an alien attack.
"X = Ben + 2" is crucial as Ben acquires one of his most powerful (and difficult to control) alien forms. They strictly ground him from using the Omnitrix
Vreedle brothers are sent to repossess Ship.
A fire-controlling villain named Heatblast (actually a copy of Ben’s original alien) rampages across the city. Ben discovers it’s a DNAlien remnant. Key moment: Ben faces a “mirror match” against an evil Heatblast.
Ben 10: Alien Force consisted of 46 episodes, split across three seasons. Season 1 (2008)
Article last updated: October 2025. Episode order based on original Cartoon Network airdates and DVD box sets.