BTMT/Season 3

Season 3
Ah, Season 3. The Ultimate secrets revealed, all new villains, and the return of the Nanochips, along with a whole new set of ten aliens. This is gonna be good!

Episode 1: Two New Crooks
Two new evil aliens show up, an unnamed Gourmand and Fich, who are the same species as Upchuck and Ripjaws, and Ben and Co. must get to the bottom of this.

Episode 2: Return of the Nanochips
The Nanochips return since their attack on the Andromeda aliens, and begin to form a mysterious plan, all with an unknown leader.

Episode 3: Save Petropia!
Tetrax and Sugilite call Ben and Co. to Petropia, where Vulkanus threatens to blow it up for the Taedenite it's made of.

Episodes 4 and 5: Ultimate Kate (Parts 1 and 2)
In this crossover with Kate Underlocke Rampage, Kevin is cured, but Kate connects to the Omnitrix in an unexpected way. She ends up getting mutated into a combo of all her mutations! To top it all off, Kevin must make the Ultimate sacrifice to stop her, now that she was driven insane by the mutation.

Episode 6: More DNA Taken
The unnamed Gourmand, now revealed to be Zeno, is taking more DNA samples. Ben and Co. now realise that the Nanochips are working with them.

Episode 7: Ben 10: Phineas and Ferb Style!
Ben and Co. are attacked by SevenSeven, and a spying Will Harangue sees this, and tries to get the "Hate Ben 10" club of the distrusting people to come to the scene. Meanwhile, Max is fighting a regenerating Vilgax. Non-canon.

Episode 8: Is It Validus?
Ben and Co. find Victor Validus working with the Nanochips, and they stop him!

Episode 9: Super Tennyson Bros.
Ben and Co. get sucked into Super Jario World and must get out before it's too late. Little do they know, someone else is in there...

Episode 10: Return of Clancy
It turns out Clancy isn't dead, and now he's working with the Nanochips, too, since they're sorta like bugs.

Episodes 11-12: Dawn of... Evil Ben! (Parts 1 and 2)
Ben discovers and alternate, evil version of himself, and must stop him!

Episode 13: The Connection
Azmuth explains to Ben and Co. what the Planetary Connection is.

Episode 14: 1-Up
Ben must learn the secrets of his new alien, 1-Up, as he fights a rogue Appoplexian.

Episode 15: Sweet Dreams
Ben wakes up to find his house ransacked. He then has to fight all his villains at once when the Omnitrix stops working!

Episode 16: Connectivity
Paparo discovers the secret to activating the Planetary Connection, and decides to try it out on Earth.

Episode 17: Playing With Mud
Argit bets Vulkanus that he could defeat Mr. and Mrs. Mann, the two Sludges from Big Fat Alien Wedding, but the two escape and rampage through the city. It's up to Ben to stop them.

Episode 18: Say Goodbye to the Chips
Ben and Co. call on the real Victor and Elena Vaildus' help to destroy the Nanochips, slowing down Paparo's progress.