Season 1

Ben 10, later known as Ben 10 Classic, is an American animated series created by the group Man of Action and produced by Cartoon Network Studios. The pilot episode And Then There Were 10, aired on December 27, 2005, as part of a sneak peek of Cartoon Network's Saturday morning lineup.

This series was followed-up by three sequels called Ben 10: Alien Force, Ben 10: Ultimate Alien, and Ben 10: Omniverse, and was later rebooted.

Plot
Ten-year-old Ben Tennyson, his ten-year-old paternal first-cousin Gwen, and their paternal Grandpa Max start their summer camping trip. Ben goes stomping off into the woods after another fight with Gwen, whom he is not happy to have along on the trip, and finds an alien pod on the ground. When he examines it, he finds a mysterious, watch-like device, called the Omnitrix. The device attaches permanently to his wrist and gives him the ability to transform into a numerous variety of alien life-forms, each with their own unique powers and abilities. Although Ben realizes that he has a responsibility to help and save others with these new abilities at his disposal, he is not above a little ten-year-old super-powered mischief now and then. Along with Gwen and Max, Ben embarks on an adventure to fight evil, both extraterrestrial and earthly. Ben has faced lots of villains including villains fighting together in a team or a partner once such as when Vilgax and Kevin 11 fought Ben.

Episodes
Ben 10 lasted for 4 seasons with a total of 49 episodes. 3 movies and 9 shorts were also aired.

For more information see Ben 10/Episodes

Characters
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Main Characters

 * Ben Tennyson
 * Ultra Ben
 * Gwen Tennyson
 * Max Tennyson

Secondary Characters

 * Cash Murray
 * J.T.
 * Azmuth
 * Retaliator
 * Tetrax Shard
 * Gluto
 * Myaxx
 * Lieutenant Steel
 * Xylene
 * Kai Green
 * Wes Green
 * Ultimos
 * Tini
 * Synaptak
 * Cooper Daniels

Tennyson Family

 * Carl Tennyson
 * Sandra Tennyson
 * Vera Tennyson
 * Gordon Tennyson
 * Betty Jean Tennyson
 * Joel Tennyson
 * Camille Mann-Tennyson
 * Lucy Mann

Others

 * Jamie
 * Ben's Teacher
 * Captain Shaw
 * Roger
 * Dr. Kelly
 * Sumo Slammer Collecting Boy
 * Krakken
 * Marty
 * Earl
 * Hotel Guard
 * Brad
 * Councilwoman Liang
 * Bob
 * Joe
 * Technorg
 * Gilbert
 * Andy
 * Mandy
 * Ah Puch
 * Harold
 * Edith
 * Mildred
 * Amazing Alan
 * Tiffany
 * Donovan GrandSmith
 * Eddie GrandSmith
 * Thomas Jingles
 * Elsgood
 * Elves
 * Ishiyama
 * Tim Dean
 * Abel North
 * President
 * Todd Maplewood
 * Joan Maplewood
 * Vance Vetteroy
 * Shag Carpeting
 * Dr. Shueman
 * Steve Cummings
 * Hector
 * Mr. Zu
 * Shelby
 * Laurence Wainright
 * Gaterboy
 * Porcupine
 * Mrs. Fang
 * Lobster Man
 * Immovable Object

Future

 * Ben 10,000
 * Gwendolyn Tennyson
 * Max Tennyson
 * Ken Tennyson
 * Kevin Levin
 * Devlin Levin

Gwen 10

 * Gwen Tennyson
 * Ben Tennyson
 * Max Tennyson

Goodbye and Good Riddance

 * Carl Tennyson
 * Sandra Tennyson
 * Ben's Dog
 * Peterson
 * Arnold
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Main Villains

 * Vilgax
 * Drones
 * Sixsix
 * Kraab
 * Rojo
 * Kevin Levin
 * Zs'Skayr
 * Viktor
 * Yenaldooshi
 * Mummy
 * Driscoll
 * Enoch
 * Forever Ninja

Secondary Villains

 * Dr. Animo
 * Mutant Frog
 * Mutant Hamster
 * Mutant Cockatiel
 * Mutant Mammoth
 * Mutant Tyrannosaurus
 * Heatbat
 * Mutant Seagull
 * Mutant Squid
 * Mutant Lepidopterran
 * Mutant Bat
 * Mutant Prairie Dog
 * Mutant Hornet
 * Zombozo
 * Acid Breath
 * Frightwig
 * Thumbskull
 * Hex
 * Charmcaster
 * Stone Creatures
 * Clancy
 * Phil Billings
 * Sublimino
 * Slix Vigma

Others

 * Jonah Melville
 * Jack
 * Duane
 * Limax
 * Megawhatts
 * Rojo's Gang
 * Howell Wayneright
 * Leader Alien
 * Enforcer Alien
 * Interpreter Alien
 * Great One
 * Dr. Doomacus
 * Mycelium
 * Living Mushrooms
 * Scooter
 * Missy
 * Pinky
 * Kenko
 * Coach Finn
 * Squires
 * S.A.M.
 * Mr. Mann
 * Mrs. Mann
 * Mann Family's Bodyguard
 * Camille's Ex-Boyfriend
 * Baron Highway
 * Turbine
 * Road Rage
 * Mr. Beck
 * Bug-Lite
 * Tetramand Prisoner
 * Piscciss Volann Prisoner
 * Lepidopterran Prisoner
 * Nightmarish Alien
 * Gladiator Prisoner

Future

 * Vilgax
 * Dr. Animo
 * Exo-Skull
 * Kevin 11,000
 * Sploot
 * Mot Snikrep

Gwen 10

 * Vilgax
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Original

 * Diamondhead
 * Four Arms
 * Ghostfreak
 * Grey Matter
 * Heatblast
 * Ripjaws
 * Stinkfly
 * Upgrade
 * Wildmutt
 * XLR8

Additional

 * Blitzwolfer
 * Cannonbolt
 * Ditto
 * Eye Guy
 * Frankenstrike
 * Snare-oh
 * Upchuck
 * Way Big
 * Wildvine

Future Aliens

 * Arctiguana
 * Atomix (mentioned)
 * Buzzshock
 * Sandbox (mentioned)
 * Shellhead (mentioned)
 * Snakepit (mentioned)
 * Spitter
 * Toepick (mentioned)

Fusions

 * Diamond Matter
 * Heat Jaws
 * Stink Arms
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Video Games

 * Ben 10 (HyperScan Game)
 * Ben 10: Protector of Earth

Movies

 * Ben 10: Race Against Time
 * Ben 10: Secret of the Omnitrix
 * Ben 10: Destroy All Aliens

Theme Song
The theme song of Ben 10 was sung by Moxy and written by Andy Sturmer. In the first and second seasons, Ghostfreak was the ninth alien in the theme song. Cannonbolt replaced Ghostfreak as the ninth alien in the third and fourth seasons.

Lyrics
It started when an alien device did what it did, And stuck itself upon his wrist with secrets that it hid, Now he's got super powers, he's no ordinary kid, He's Ben 10!.... (Ben 10! Ben 10!)

So if you see him, you might be in for a big surprise, He'll turn into an alien before your very eyes, He's slimy, creepy, fast and strong, he's every shape and size, He's Ben 10!.... (Ben 10!)

Armed with power, he's on the case, Fighting off evil from Earth or space, He'll never stop till he makes them pay, 'Cause he's the baddest kid to ever save the day! Ben 10! (Ben 10! Ben 10! Ben 10! Ben 10! Ben 10! Ben 10!)

Trivia

 * Recurring lines in the series are: "Oh man!", "Going hero!", and "It's hero time!".
 * Ghostfreak was replaced by Cannonbolt in the theme song from season 3 onwards, due to his escape, although, Ghostfreak could be seen in the Season 3 intro at the very end, when all the aliens get sucked into the watch before the logo comes up.
 * A remixed version of the theme was played in Ben 10: Race Against Time.
 * Ben 10 was produced in both 16:9 (HD) and 4:3 (SD/widescreen) formats, but was only aired in 4:3 due to restrictions put in place by Cartoon Network. As of June 14, 2015, all four seasons are available in HD and widescreen format on iTunes. Amazon Instant Video and Google Play has all four seasons in widescreen format.
 * In Norway, Sweden and Denmark, episodes 22 and 23, 24 and 25, and 27 and 28 switched places.
 * In the latest reruns, the theme song has been shortened (except in the episodes Ben 10 vs. the Negative 10: Part 1 and 2). The current airings on Boomerang have now gone back to the original theme song's length.
 * In Poland, episodes 50, 51, and 52 were switched in airing.
 * In Heroes United, Rex makes his own theme song similar to the Ben 10 theme song.
 * On iTunes the icons of each season include the following aliens: Season 1 - Ben (with Four Arms icon), Season 2 - Cannonbolt, Season 3 - Blitzwolfer, Season 4 - Perk Upchuck (varies to Ditto on DVD)