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Undercover is the eighteenth episode of Ben 10: Alien Force.


Kevin, Gwen and Ben destroy a teleporter they were working on and need help repairing it. Kevin suggests Cooper, the young boy who had helped the Tennysons in the past. Unfortunately, Cooper has been kidnapped by the DNAliens.

They track him to Los Soledad, the abandoned military base where Professor Paradox built his time machine. They discover that the Highbreed have erected a cloaking field, built by Cooper over the area, concealing a mysterious arch-like device. They free Cooper and have him destroy the cloaking generator, during which he has visions of the arch acting as a gateway for a fleet of ships and the Earth being destroyed. Despite destroying the generator, the Highbreed manage to repair it and continue their operations unhindered.

Noteworthy Events

Major Events

Minor Events

  • It is revealed that DNAliens cannot handle very high frequency sounds.



Aliens Used

Spells Used



(after the teleporter pad was destroyed)
Ben: Is everyone alright?
Kevin: Forget that, what about the Teleporter Pad!
Gwen: Deep down, he's really glad we're okay.
Ben: At least we don't have to worry about any "banana-fly" monsters.

Quotes Right


Kevin: So, Gwen... happy to see your ex?
Gwen: Zip it! (to Ben) You just had to mention the crush?
Ben: Probably not.

Quotes Right


Cooper: (to Gwen) The way you came storming in there, like how Princess Elena rescued me last week from the Caverns of Unforgiving Dismay!
Gwen: Excuse me?
Cooper: In Nations of Conquest, the M.M.O.R.P.G I play.
Gwen: Excuse me?
Cooper: Massive multiplayer online role-playing game.
Kevin: Yeah Gwen, and your power is being plus-3 nerd bait.

Quotes Right


Gwen: Ben? Are you hiding?
Ben: No. It’s just, if a fly lands on that banana when it teleports and it rematerializes as a deathly banana fly monster. I don't wanna be standing right next to it, is all.

Quotes Right

Naming and Translations

Language Name Origin
French La Couverture The Cover
Hungarian Aligátorbőrben Aligatorskin
Portuguese (Br) Camuflagem Camouflage
Spanish (HA) Un Viejo Conocido An Old Acquaintance
Spanish (Spain) Encubiertos Undercover


  • When Kevin said to Ben "You used to turn into one of those (insects)", he was referring to Stinkfly.
  • Ben's concerns about a "banana fly monster" in the beginning of the episode is a reference to the science-fiction horror film The Fly, the main character had a similar problem when he and a fly entered the teleporter he was working on at the same time transforming him into a fly monster.
  • The teleporter is very similar to Paradox's time machine.
  • The second hint towards the events of War of the Worlds are foreshadowed when Cooper was destroying the machine.


  • Though Kevin shows tendencies of being protective, jealous and mad when other guys had a crush on Gwen, he was surprisingly good humored towards Cooper for his adolescent feelings for Gwen.
Ben 10: Alien Force Episodes
Season 1
Ben 10 Returns: Part 1Ben 10 Returns: Part 2Everybody Talks About the WeatherKevin's Big ScoreAll That GlittersMax OutPier PressureWhat Are Little Girls Made Of?The GauntletParadoxBe-KnightedPlumbers' HelpersX = Ben + 2
Season 2
Darkstar RisingAlone TogetherGood Copy, Bad CopySave the Last DanceUndercoverPet ProjectGroundedVoidedInside ManBirds of a FeatherUnearthedWar of the Worlds: Part 1War of the Worlds: Part 2
Season 3
Vengeance of Vilgax: Part 1Vengeance of Vilgax: Part 2InfernoFool's GoldSimpleVreedle, VreedleSinglehandedIf All Else FailsIn Charm's WayGhost TownTrade-OffBusy BoxCon of RathPrimusTime HealsThe Secret of ChromastoneAbove and BeyondVendettaThe Final Battle: Part 1The Final Battle: Part 2
Ben 10: Alien Swarm

Start a Discussion Discussions about Undercover


    2 messages
    • the wikia told that goops antigravityprojector passing through the door eror came in too epesodes "CATH A FALLING STAR" and "...
    • on the wikia