Back in Action: Alien Universe

Featured Series: December 2012 Logo by NickFusi0n Back in Action: Alien Universe is the sequel series to Ben 10: Alien Universe announced on August 19, 2012 that premiered on August 29, 2012.

Fans
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 * 1) GIVE UP, STOLEN PLUMBER SHIP! YOU CAN'T ESCAPE FROM RATH! YAAH! (The ship begins to crash) CRASHING'S GOOD TOO! RATH CAN CRASH ALL DAY!! (Rath falls down) NOW YOU'RE USING GRAVITY!! WELL FORGET IT! YOU CAN'T BEAT RAA.. (slams into ground) 15:24, September 20, 2012 (UTC)
 * 2) OMNIVERSE  (Wall - Blog - Contribs)  12:27, October 11, 2012 (UTC)
 * 3) I should've done this a long time ago....
 * 4) badadadada I'm lovin' it --I am the Ruler of all that belongs to the Light! The Photon Commander!  (Wall - Blog - Contribs)  10:03, March 9, 2013 (UTC)
 * ISM SAYS THIS IS EPIC :D  TALK TO ISM  :D  READ ISM'S LEGENDS  18:04, December 23, 2013 (UTC)
 * 1) I am vengeance. I am the night. I am BATMAN! (Wall - Blog - Contribs) 18:11, January 5, 2014 (UTC)

Episodes

 * Main article: /Episode Guide/

3 seasons have been confirmed, with the first two arriving at 26 and 14 episodes (for a total of 40 episodes), respectively. A movie, tentatively titled Heroafter is also in early production, existing as a story to succeed the series but precede the sequel.

Fan Episodes

 * Also See: /Fan Episode Guide/

Fans of the show are free to post their own episodes. These fan episodes are neither considered canon or non-canon to the series itself, unless signed on the episode page as specifically being one or or the other by Stripes. align=center preload=Back in Action: Alien Universe/Episode Layout buttonlabel=Start Making Your Episode!

Season 1
17 year old Ben discovers the plot of the Thep Khufan Commander, and together with many of his closest friends and newest allies, he must thwart the Commander or sacrifice the Earth and universe to him.

Main Characters

 * Ben Tennyson (16 y/o in Infernosphere; 17 y/o Limited on)
 * Gwen Tennyson (16 y/o in Infernosphere; 17 y/o Limited on)
 * Kevin Levin (18 y/o Limited on)
 * Julie Yamamoto (Deceased; 16 y/o, 17 y/o at unknown point)
 * Chelsey Tennyson (21 y/o)

Recurring Characters

 * Mercedes Barnes
 * Maxwell "Grandpa Max" Tennyson
 * Future Ben Tennyson (22 y/o)
 * Karin Frikton
 * Azmuth
 * Professor Paradox
 * Verdona "Grandma Verdona" Tennyson
 * Ship
 * Cooper Daniels
 * Myaxx

Minor Characters

 * Eunice
 * Sandra Tennyson

Main Villains

 * Thep Khufan Commander
 * Scarogus
 * Albedo
 * Elena Validus

Recurring Villains

 * Charmcaster
 * Sii
 * Mistress
 * Malevolence
 * Slix
 * Vilgax
 * Cyanne (originally a hero)
 * Mosquito
 * Rhino

Deceased Villains

 * Nightcaster II
 * Clancy
 * Rojo
 * Thep Khufan Commander
 * Loitus

Ben's Aliens
Any alien in bold was originally kept a secret. As of its reveal, it is no longer, and is subtracted from the remaining secret classic alien counter. Any alien in a link is unique to the series.

Original 10

 * Swampfire
 * Echo Echo
 * Humongousaur
 * Jetray
 * Big Chill
 * Chromastone
 * Brainstorm
 * Spidermonkey
 * Goop
 * Alien X

Classic Aliens

 * Heatblast
 * Diamondhead
 * XLR8
 * Four Arms
 * Ghostfreak
 * Stinkfly
 * Grey Matter
 * Upgrade
 * Cannonbolt
 * Way Big
 * Articguana
 * Benmummy
 * Buzzshock
 * Eye Guy
 * Ditto
 * Benvicktor
 * A few more secret classic aliens

Additional Aliens

 * Rath
 * Lodestar
 * Fasttrack
 * Astrodactyl
 * Water Hazard
 * Terraspin
 * NRG
 * Forge (Armodrillo)
 * AmpFibian
 * Anos
 * Bugbite
 * Streak
 * Obsorber
 * Nigester (removed in Ten Plus Twenty)
 * Plastikitee
 * Muckslide
 * Autosassin
 * Boomchomp

Ultimate Aliens

 * Ultimate Big Chill
 * Ultimate Wildmutt
 * Ultimate Cannonbolt
 * Ultimate Swampfire
 * Ultimate Echo Echo
 * Ultimate Humungousaur

Season 2+ Aliens

 * Combustiball
 * Frisbit
 * Alkamine
 * Brawnoceros
 * Plasmodic
 * Dreadsense
 * "Titanium Alien"
 * Cardstruct
 * Several More Unique Unknown Aliens

Future Aliens

 * (See Future Ben's list of aliens)

Trivia

 * Unless otherwise stated below, all Assault Omnitrix aliens assume their original series/Alien Force/Ultimate Alien (whichever is the latest) appearances. This also applies for Gwen's Anodite form.
 * Grey Matter appears with his Omnitrix on his chest, as it would have had he appeared in Ultimate Alien. As of Hit and Miss, he has donned his Omniverse clothing but original series appearance.
 * Upgrade bears great resemblance to Malware in Omniverse.
 * Articguana, Buzzshock, and Stinkfly will appear with their original series appearances.
 * The Rustbucket has been confirmed to be much more realistic.
 * On YouTube, the show was referred to as Ben 10: Alien Universe Re-Animated.