The series follows the adventures of sixteen-year-old Ben Tennyson, wielder of the Omnitrix, an extremely powerful watch-style device that allows Ben to change into a multitude of various aliens; each with their own special abilities and skills. The storylines alternate between that of eleven-year-old Ben (one year after the original series) and sixteen-year-old Ben (a few months after Ben 10: Ultimate Alien). After Gwen leaves for college and Kevin leaves to be closer to her, Ben gets a new partner, a rookie by-the-book alien plumber named Rook Blonko (surname first). On a mission to explore a secret underground alien city named Undertown, Ben explores the quirkier side of things in the alien underground and discovers that enemies from his past are looking for a rematch.
While Khyber struggles to control his dog's transformations, Dr. Psychobos tells Malware that he will need a part of the Omnitrix to fix it. This causes Dr. Psychobos to infiltrate the Plumbers' base on Earth and steal a part from Ben's Omnitrix causing it to malfunction. The malfunctioning of the Omnitrix causes its powers to leak into Psyphon, Bubble Helmet, Fistina, and Liam giving them abilities very similar to the Omnitrix aliens.
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s02e11Outbreak2012-11-2414:00⌄
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Outbreak
s02e11 ·
2012-11-24 ·
14:00
A part is stolen from the Omnitrix by Dr. Psycobos causing it to malfunction. The malfunctioning of the Omnitrix causes it's powers to leak into Psyphon, Bubblehead, Fistina, and Liam giving them powers similar to the Omnitrix aliens.
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s02e02Many Happy Returns2012-12-0111:00⌄
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Many Happy Returns
s02e02 ·
2012-12-01 ·
11:00
Gwen and Kevin pay Ben a surprise visit; a Tetramand princess and her father's fleet of warships threaten the Earth.
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s02e12Many Happy Returns2012-12-0114:00⌄
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Many Happy Returns
s02e12 ·
2012-12-01 ·
14:00
Gwen and Kevin visit Bellwood during spring break, but the latter has an additional reason to visit as he needs Ben to hide him from a Tetramand Princess named Looma who intends to marry Kevin as part of a ritualistic courtship he entered for the wrong reasons. Things worsen when Looma's father, Warlord Gar, holds the world hostage to make sure his daughter is married.
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s02e03Gone Fishin?2012-12-0811:00⌄
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Gone Fishin?
s02e03 ·
2012-12-08 ·
11:00
No episode summary is available.
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s02e13Gone Fishin?2012-12-0814:00⌄
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Gone Fishin?
s02e13 ·
2012-12-08 ·
14:00
Magister Patelliday is kidnapped by pirates who rob ships and put them in giant glass bottles to sell them. They intend to devour Patelliday. Any attempts at rescue are hard, since they have a Krakken and a robot army.
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s02e04Blukic and Driba Go to Mr. Smoothy's2012-12-1511:00⌄
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Blukic and Driba Go to Mr. Smoothy's
s02e04 ·
2012-12-15 ·
11:00
Ben and Rook must stop Trumbipulor from gaining absolute power (which turned out to be peanuts since they can increase the size of Trumbipulor's kind). Yet the main plot occurs when Blukic and Driba set out to find a Mr. Smoothy's after seeing an advertisement for their new grasshopper smoothies and have many misadventures along the way with one of them tying into fighting Trumbipulor's robotic rats.
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s02e14Blukic And Driba Go To Mr. Smoothy's2012-12-1514:00⌄
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Blukic And Driba Go To Mr. Smoothy's
s02e14 ·
2012-12-15 ·
14:00
Ben and Rook must stop Trumbipulor from gaining absolute power while Blukic and Driba set out to find Mr. Smoothy's.
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s02e05Malefactor2012-12-2211:00⌄
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Malefactor
s02e05 ·
2012-12-22 ·
11:00
Ben and Rook are attacked by Khyber and his dog (which can now transform at will without Khyber's whistling) at the Old Bellwood Days Festival. In a flashback, it is also revealed how Malware had obtained his current mutated Galvanic Mechamorph form.
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s02e15Malefactor2012-12-2214:00⌄
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Malefactor
s02e15 ·
2012-12-22 ·
14:00
Ben and Rook are attacked by Khyber at a festival.
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s02e06Arrested Development2013-01-0511:00⌄
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Arrested Development
s02e06 ·
2013-01-05 ·
11:00
An old rival of Ben Tennyson named Billy Billions turns Ben and Rook into kids again while bringing Dimension 12 robots to Earth and controlling them.
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s02e16Arrested Development2013-01-0514:00⌄
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Arrested Development
s02e16 ·
2013-01-05 ·
14:00
Billy Billions turns Ben and Rook into kids again.
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s02e07Bros in Space2013-01-1211:00⌄
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Bros in Space
s02e07 ·
2013-01-12 ·
11:00
Ben and Rook visit Rook's family on Revonnah during the Amber Ogia harvest. Meanwhile, Fistrick trains the planet's local rodents called the Muroids to steal the Amber Ogia as fuel for the planet-destroying satellite in his possession.
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s02e17Bros in Space2013-01-1214:00⌄
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Bros in Space
s02e17 ·
2013-01-12 ·
14:00
Ben and Rook visit Rook's family on Revonnah during the Amber Ogia harvest. Meanwhile, Fistrick trains the planet's local rodents called the Muroids to steal the Amber Ogia as fuel for the planet-destroying satellite in his possession.
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s02e08Ben Again2013-01-1911:00⌄
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Ben Again
s02e08 ·
2013-01-19 ·
11:00
Eon returns and switches Ben's mind with his younger self as part of a plot to take over the timelines. It's up to Paradox, and the two Gwens from the past and present, to help the Bens' regain their rightful minds and help to defeat Eon.
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s02e18Ben Again2013-01-1914:00⌄
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Ben Again
s02e18 ·
2013-01-19 ·
14:00
Eon returns and switches Ben's mind with his younger self as part of a plot to take over the timelines. It's up to Paradox to help the Bens' regain their rightful minds and help to defeat Eon.
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s02e09Store 232013-01-2611:00⌄
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Store 23
s02e09 ·
2013-01-26 ·
11:00
Following Ben helping Grandpa Max defeat Liam, Ben takes Blukic and Driba to look for the 23rd Mr. Smoothy restaurant. After, Ben, Blukic, and Driba enter the 23rd Mr. Smoothy restaurant that keeps disappearing, they find it run by Professor Blarney T. Hokestar who is using a dimensional device to move the restaurant to different dimensions. In one dimension, Ben meets an alternate version of himself who is very rich, names his aliens differently and has lost his beloved Grandpa Max.
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s02e19Store 232013-01-2614:00⌄
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Store 23
s02e19 ·
2013-01-26 ·
14:00
Following Ben helping Grandpa Max defeat Liam, Ben takes Blukic and Driba to look for the 23rd Mr. Smoothy restaurant. After Ben, Blukic, and Driba enter the 23rd Mr. Smoothy restaurant that keeps disappearing, they find it run by Professor Blarney T. Hokestar who is using a dimensional device to move the restaurant to different dimensions. In one dimension, Ben meets an alternate version of himself who names his aliens differently and has lost his Grandpa Max.
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s02e10Special Delivery2013-02-0211:00⌄
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Special Delivery
s02e10 ·
2013-02-02 ·
11:00
After Ben accidentally destroyed Mr. Baumann's car during his fight with Psyphon's minion, Thunderpig, Mr. Baumann orders Ben to make deliveries for him without using the Omnitrix. When Ben unknowingly gets the Dwarf Star (a massive power source that was going to be sold at Psyphon's auction) in his possession, Ben must fight off Pysphon, Fistina, Zombozo, Trumbipular, the Vreedle Brothers, Fistrick, Vulkanus, Sunder, and Seebik to keep them from getting absolute power.
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s02e20Special Delivery2013-02-0214:00⌄
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Special Delivery
s02e20 ·
2013-02-02 ·
14:00
After Ben accidentally destroyed his car during his fight with Psyphon's minion Thunderpig, Mr. Baumann orders Ben to make deliveries for him without using the Omnitrix. This won't be easy for Ben when Psyphon comes after him.
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