List of Ben 10: Alien Force episodes

This is a list of episodes in the American animated television series Ben 10: Alien Force.

After setting aside the Omnitrix some years ago, fifteen-year-old Ben Tennyson is enjoying a normal life. After winning a soccer game and meeting a girl named Julie, he visits Grandpa Max only to discover that he's disappeared. Inside Max's RV, the Rust-bucket, Ben finds a Holo-viewer with a recording from Max telling Ben that he has the Omnitrix and he's safe. However, Ben has had the Omnitrix ever since he took it off years ago.

He asks his favorite, fifteen-year-old cousin Gwen for advice, wondering if Grandpa wants him to wear the Omnitrix again. Soon, they meet Magister Labrid, an agent of the Plumbers. Stating that he's Max's partner in a case he was working on, Ben and Gwen decide to team up with him. Ben decides to put the Omnitrix back on. The first place they go is to a train station where an arms trade between the Forever Knights and the DNAliens, brokered by Kevin Levin. They attempt to arrest the Knights and the aliens, and a battle follows. When Ben tries to dial in his alien on his Omnitrix, the device reboots and recalibrates into a thin watch with a color scheme of green and black, making it more stylish and giving him access to 10 new aliens which are more powerful than his aliens he had before. The DNAliens get away, the Forever Knights escape with one of the weapons crates, and Kevin is captured. The Plumber asks Kevin for help in finding the Knights' hideout. Kevin, having not been paid (so he says), leads the group to a large castle. Inside, they find all sorts of medieval artifacts, but Ben accidentally knocks over a suit of armor which awakens a robotic dragon.

Fleeing from the dragon, the group runs into an army of Forever Knights. In the ensuing confrontation, Magister Labrid is killed when he saves Kevin's life, and Kevin joins Ben and Gwen on their search for Max to repay that debt. Using a leftover Laser Lance, Gwen is able to trace it back to its original owners. The soon find a secret underground base, they discover an army of DNAliens. Sneaking in, the find that Max isn't there anymore, and on their way out encounter the Highbreed in charge of the ship.

Annoyed at being discovered, the Highbreed commander defeats the team, and orders the termination of all life within a five-mile radius to eliminate any witnesses. Using Humongousaur, Ben is successful in his efforts to stop the commander, he learns that any damage he receives while transformed is inflicted upon his human form as well. Deciding to finish Max's last mission, Ben, Gwen, and Kevin become a team. But, according to another Highbreed deep inside another base, they have no idea what they're up against.

The authorities of a local town named Grover's Mill arrest a half-human, half-Pyronite boy named Alan for arson and criminal damage. Alan is wearing a Plumber's badge, which the local sheriff triggers when he confiscates it. The badge signals Kevin's badge, which leads Ben, Kevin and Gwen to Alan, thinking Alan's badge is Max's.

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