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.
The Secret Saturdays come to Bellwood to investigate a rash of chupacabra attacks. Ben and Rook assist, finding the chupacabras have been draining aliens of their lifeforce. They soon discover that the chupacabras are being controlled by Dr. Animo, who is an old business assciote of V.V. Argost. Using the alien lifeforce, Animo successfully revives Argost in a mis-matched hybrid body. Now Ben, Rook, and the Saturdays must work together to turn the tables on the alliance of Dr. Animo and V.V. Argost when they plan to make an army of "Franken-Cryptids.
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s04e11T.G.I.S.2013-10-0313:00⌄
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T.G.I.S.
s04e11 ·
2013-10-03 ·
13:00
The Secret Saturdays come to Bellwood to investigate a rash of chupacabra attacks.
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s04e02Food Around the Corner2013-10-1210:00⌄
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Food Around the Corner
s04e02 ·
2013-10-12 ·
10:00
Ben as Gravattack attempts to moderate a fragile peace treaty, but must endure the attacks of tiny alien fleas, which have inhabited his body. Rook shrinks down in attempt to get the fleas off him before the peace treaty is ruined. But it turns out that the Lewodon named Poltroon, sent the fleas onto Gravattack to destroy his core, causing a meltdown in attempt to destroy both the Lewodons and the Appoplexians, therefore causing a war between the 2 species and taking power to destroy his enemies. Now Rook must find a way to change Ben back before they are destroyed and to stop Poltroon.
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s04e12Food Around The Corner2013-10-1213:00⌄
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Food Around The Corner
s04e12 ·
2013-10-12 ·
13:00
Ben as Gravattack attempts to moderate a fragile peace treaty, but must endure the attacks of tiny alien fleas which have inhabited his body.
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s04e03O Mother, Where Art Thou?2013-10-1910:00⌄
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O Mother, Where Art Thou?
s04e03 ·
2013-10-19 ·
10:00
Octagon and Rhomboid Vreedle once more blow themselves up. After reviving again, they decide to prove themselves to Ma Vreedle by pulling off successful crimes; to ensure success in numbers, they take a Pretty Boy Vreedle to assist them under the belief that Ma won't notice one out of the several others missing. When Ma does discover this (but not that her dumbest sons were responsible), she threatens to blow up the sun if the Plumbers don't find Pretty Boy. Meanwhile Ben tries to hide from his mom so he won't get seconds on the dinner that he hates.
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s04e13O Mother, Where Art Thou?2013-10-1913:00⌄
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O Mother, Where Art Thou?
s04e13 ·
2013-10-19 ·
13:00
Ma Vreedle threatens to blow up the sun if Ben and the Plumbers don't find her missing son!
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s04e04Return to Forever2013-10-2610:00⌄
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Return to Forever
s04e04 ·
2013-10-26 ·
10:00
The Forever Knights are back, despite the death of Old George. Led by the new Forever King, Dr. Joseph Chadwick, the group plans to erase all alien DNA on Earth. Jimmy Jones discovers that Will Harangue, whose popularity has nosedived following "The Frogs of War", is helping the Forever Knights. After the Forever Knights are taken care of, Ben might have a fitting punishment in mind for the Harangue.
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s04e14Return to Forever2013-10-2613:00⌄
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Return to Forever
s04e14 ·
2013-10-26 ·
13:00
Albedo seeks a device that will finally change him back into his Galvan form; meanwhile, Ben is locked in Plumber HQ prison.
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s04e05Mud is Thicker Than Water2013-11-0210:00⌄
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Mud is Thicker Than Water
s04e05 ·
2013-11-02 ·
10:00
While Rook and Kevin are at an auto show, Ben, Gwen, and Cousin Lucy (who is the first of her kind to become a Plumber) try to find out how Psyphon's thugs are getting Level 7 Plumber technology. Gwen suspects that Lucy is the mole because of her shapeshifting abilities as a Sludgepuppy, and her love of tricks when she was younger, but it turns out that it is an old enemy: Gorvan.
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s04e15Mud is Thicker Than Water2013-11-0213:00⌄
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Mud is Thicker Than Water
s04e15 ·
2013-11-02 ·
13:00
Ben, Gwen and Cousin Lucy try to find out how Psyphon's thugs are getting Plumber technology.
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s04e06OTTO Motive2013-11-0911:00⌄
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OTTO Motive
s04e06 ·
2013-11-09 ·
11:00
While attending an intergalactic auto show on Khoros, Kevin, Rook and Argit run into OTTO, an old enemy of Kevin and Argit that stranded them alone in the Null Void. But OTTO and Violent Offenders end up steal some of the most expensive cars, and OTTO turns into a giant robot, leaving Ben having to stop him.
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s04e16OTTO Motive2013-11-0914:00⌄
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OTTO Motive
s04e16 ·
2013-11-09 ·
14:00
Kevin and Rook run into an old enemy from the Null Void while attending an intergalactic auto show.
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s04e07The Ultimate Heist2013-11-1611:00⌄
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The Ultimate Heist
s04e07 ·
2013-11-16 ·
11:00
Albedo (who is disguised as Ben) seeks a device that will finally change him back into his Galvan form. Meanwhile, Ben (who has been disguised as Albedo by Khyber) is locked in Plumber HQ prison. It reveals Khyber has disguised Ben and Albedo as each other for their plan to work. Meanwhile Argit claims to be the hero of Undertown after stopping the Waybads in The Frogs of War.
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s04e17The Ultimate Heist2013-11-1614:00⌄
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The Ultimate Heist
s04e17 ·
2013-11-16 ·
14:00
Albedo seeks a device that will finally change him back into his Galvan form.
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s04e08A Fistful of Brains2013-11-2311:00⌄
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A Fistful of Brains
s04e08 ·
2013-11-23 ·
11:00
After Ben falls for Albedo's trap, Grandpa Max and Rook search all over the galaxy looking for Ben. Meanwhile he's been secretly trapped on Khyber's hidden personal hunting preserve fighting Khyber's new pet that now wears the Nemetrix. But as Ben finds a way out, he has to deal with Albedo. When Grandpa Max and Rook arrive, they find that Albedo and Khyber have Azmuth as their captive.
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s04e18A Fistful of Brains2013-11-2314:00⌄
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A Fistful of Brains
s04e18 ·
2013-11-23 ·
14:00
Grandpa Max and Rook are looking all over the galaxy for Ben, who is trapped on Khyber's hidden personal hunting preserve.
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s04e09For a Few Brains More2013-11-3011:00⌄
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For a Few Brains More
s04e09 ·
2013-11-30 ·
11:00
Albedo took out Azmuth's brain through his cerebral vortex. With asistance from Gwen and Kevin, Ben, Rook, Max and Azmuth (whose supreme intelligence has been diminished) and the Plumbers must find a way off Khyber's Place, to get back to Earth and stop Albedo and Khyber from taking over the galaxy by absorbing Azmuth's brain sphere.
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s04e19For a Few Brains More2013-11-3014:00⌄
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For a Few Brains More
s04e19 ·
2013-11-30 ·
14:00
Ben, Rook and Max must stop Ultimate Albedo from absorbing Azmuth's intelligence and taking over the galaxy.
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s04e10Max's Monster2013-12-0711:00⌄
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Max's Monster
s04e10 ·
2013-12-07 ·
11:00
Ben, Rook, and Grandpa Max have their hands full when Phil returns as a half-human half-Terroranchula creature as a side-effect of using the Nemetrix 5 years ago, and starts absorbing all of the electricity and lightning in Bellwood. But when he heads into Undertown's mini power-plant and starts to absorb the Megawatts, they must find a way to stop him. Ben is also suffering terrible luck with his transformations, turning into electric aliens that actually feed Phil's mutated form.
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s04e20Max's Monster2013-12-0714:00⌄
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Max's Monster
s04e20 ·
2013-12-07 ·
14:00
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