All Ben 10 Alien Force Episodes Now

Ben 10: Alien Force – A Complete Episode Guide and Retrospective

Published by: The Omnitrix Hub Reading Time: 8 minutes

If you grew up in the late 2000s, you remember the seismic shift. We traded the high-energy, cartoonish chaos of the original Ben 10 (2005) for something darker, sleeker, and more serialized. Enter Ben 10: Alien Force (2008).

After a five-year time skip, Ben Tennyson is 15, retired his heroics, and taken off the Omnitrix. That is, until his Grandpa Max vanishes. Alien Force traded the "monster of the week" formula for a war against the High Breed—a genetically superior alien race bent on purifying the galaxy.

Here is your complete guide to all 46 episodes across three seasons, plus a ranking of the must-watch arcs.

Episode 9: “The Gauntlet”

Synopsis: Kevin’s past comes back to haunt him when a former partner-in-crime steals his old armor. Ben and Kevin have a tense partnership as they track the thief. Key moment: Kevin admits he wants to be a hero. all ben 10 alien force episodes

Act III: The Con of Rath and the Treachery of Albedo (Season 3)

With the Highbreed defeated, the universe finds a tentative peace. The third season shifts focus to galactic politics and ancient powers. Ben’s fame grows, and he struggles to balance his identity as Ben Tennyson with his role as the universe's protector.

The team deals with various freelance threats, including the return of Vilgax, the conqueror who has been conquering worlds using the rules of "conqueror's challenge." Ben also deals with the volatile alien Rath and faces off against the chaotic Albedo—Ben's doppelganger who wants the Omnitrix for himself.

A major turning point occurs when Ben is attacked by a mysterious energy vampire named Michael Morningstar. Meanwhile, Gwen discovers the truth about her heritage: she and her brother Ken are actually human/Anodite hybrids. Her grandmother, Verdona, offers to take Gwen to her home world to learn magic. Gwen ultimately chooses to stay on Earth with Ben and Kevin, fully embracing her role as a protector.

The season takes a dark turn when the team discovers the existence of the "Alien X"—a celestial being of near-infinite power. Ben unlocks this form but realizes the danger of absolute power; debating with his split personalities (Bellicus and Serena) renders him immobile. Ben 10: Alien Force – A Complete Episode

The final arc begins with the return of Albedo. Having stolen the Omnitrix's designs, he creates the "Ultimatrix"—an upgraded version that allows him to evolve aliens into their "Ultimate" forms. However, Albedo is not the true mastermind.

The true villain reveals himself: Aggregor.

Aggregor is an Osmosian (like Kevin) who seeks the infinite power of the "Map of Infinity." He hunts down five aliens from the Andromeda Galaxy—Bivalvan, Galapagus, P'andor, Andreas, and Ra'ad—absorbing their powers into himself.

Ben’s old enemies unite in a fragile alliance. Vilgax returns to challenge Ben one last time for the Omnitrix, but a larger threat looms. Aggregor captures the aliens and successfully absorbs them, becoming a god-like entity capable of rewriting reality. He enters the Forge of Creation to absorb the powers of a Celestialsapien (Alien X's species) to become omnipotent. Episode 9: “The Gauntlet” Synopsis: Kevin’s past comes

In the final confrontation, Kevin makes a sacrifice. To stop Aggregor, Kevin absorbs the energy from the Ultimatrix, mutating him into a monstrous form once again. But this time, the power drives him mad. He defeats Aggregor but declares himself a god, threatening to kill Ben to keep the power.

Ben is forced into a heart-wrenching decision. With no other way to stop his best friend, Ben calls upon Sir George and the Forever Knights, using ancient alien tech to ultimately neutralize Kevin’s mutation.

The series concludes with Kevin cured and restored to normal. Ben Tennyson stands alongside Gwen and Kevin, having saved the galaxy from the Highbreed, the universe from Aggregor, and his friends from themselves. He has evolved from a boy playing hero into a true commander, ready for whatever the universe throws at him next.

Episode 26: “War of the Worlds” (Part 2)

Synopsis: Ben uses the Omnitrix’s self-destruct as a bluff. The High Breed, moved by Reinrassig’s sacrifice, agree to alter their DNA, slowly dying out but ending the war. Grandpa Max is fully healed. Key moment: The High Breed arc concludes. The Omnitrix recalibrates into a new, sleeker form.

Episode 13: “X = Ben + 2”

  • Original Air Date: July 18, 2008
  • Plot: Season finale. Ben discovers that the Omnitrix has a failsafe function: it can duplicate his DNA and create clones. He unleashes an army of Bens (each stuck in a different alien form) against a High Breed invasion fleet. Meanwhile, Kevin finally unlocks the secret location of the Map of Infinity’s first piece: it’s hidden inside the Forge of Creation, the birthplace of the universe.

A Complete Guide to Ben 10: Alien Force Episodes

Ben 10: Alien Force (2008–2010) is the first direct sequel to the original Ben 10 (2005–2008). Darker, more serialized, and aimed at a slightly older audience, the series follows a 15-year-old Ben Tennyson as he reunites with his cousin Gwen and former rival Kevin Levin to find the missing Grandpa Max. Below is a breakdown of all 46 episodes across its three seasons.

Episode 5: “All That Glitters”

  • Original Air Date: May 10, 2008
  • Plot: The team encounters a Chimera Sui Generis (Vilgax’s species) named Eight-Eight, a bounty hunter. She is hunting a shape-shifting, liquid-metal alien named Ship (later revealed to be a Galvanic Mechamorph juvenile, like Upgrade). The episode is a tense cat-and-mouse game that ends with Gwen forming an emotional bond with Ship.

Episode 2: “Ben 10 Returns” (Part 2)

  • Original Air Date: April 18, 2008
  • Plot: The trio follows a lead to a secret Plumber base hidden under a dusty desert diner. There, they meet the Plumbers’ Helpers, including a tech wizard named Cooper. The High Breed’s plan is revealed: they are releasing a DNA-altering toxin called the Xenocite, which turns hosts into mindless drones. Ben unlocks Humungousaur for the first time to battle a massive High Breed general.