Grounded

Grounded is the twentieth episode of Ben 10: Alien Force.

Plot
While fighting one of the Highbreed, Ben's parents catch him transforming into Swampfire. They forbid him from using the Omnitrix after having proof of a black eye from the fight, forcing Kevin and Gwen to fight the DNAliens by themselves. After trying to sneak out as Echo Echo, Ben gets grounded and is made to spill the beans about Gwen, getting her grounded, leaving Kevin alone. Kevin's trouble with the DNAliens and the Highbreed eventually pushes Ben over the edge, and he breaks out of his house as Humungousaur in front of his parents to help. After a short battle aboard a small ship carrying a rare isotope which the DNAliens plan on using, Ben's parents come to the rescue, admitting that they are proud of Ben and understand what he needs to do.

Major Events

 * Ben's parents learn about Ben's life of fighting evil villains with the Omnitrix and Grandpa Max being a Plumber.

Characters

 * Ben Tennyson
 * Gwen Tennyson
 * Kevin Levin
 * Carl Tennyson (first appearance)
 * Sandra Tennyson

Villains

 * Highbreed Commander (first appearance)
 * DNAliens

Aliens Used

 * Swampfire
 * Echo Echo
 * Humungousaur

Errors

 * When Kevin is facing the Highbreed for the second time, some of the black patterns are missing from the Highbreed's shoulders. Later when Kevin is captured and confronting with the Highbreed before Ben's entrance as Humungousaur, the missing patterns are back in place.
 * Although it is mentioned in Good Copy, Bad Copy that Ben's left eye twitches when he lies, it does not twitch when he lies to his parents about fighting the Highbreed.

Allusions

 * Sandra talks about "MyFacing", a reference to MySpace and Facebook.
 * Gwen talks about "Wifipedia", referring a reference to Wikipedia.

Trivia

 * When Ben is explaining about the Omnitrix to his parents, he says the DNAliens are the ones who are planning to destroy Earth.