BTMT/Season 2

Season 2
Season 2 started with Another Time Traveler and has not ended. It focuses on Ben and Co. finding the Potis Altiare to unlock Ben's Eon alien, now that they know that Eon is back. Strangely, it has no multi-part episodes, the only special being the movie.

Episode 1: Another Time Traveler
Ben and Co. track this "mystery man" that Vulkanus told them about, finding out that he is Eon.

Episode 2: Ben Vs. Gwen
Hex returns, and Ben and Co. reveal that it's Mana, not magic. Now, Hex and Charmcaster make another Gwen, and capture the real one. The new Gwen is evil, so Ben has to get to the bottom of it!

Episode 3: When Life Gives You LMNs...
Ben gets a new alien, LMN, and must figure out its powers as Sunder tries to get the Omnitrix again.

Episode 4: A Visit From Fibrus
A piece of living paper, who's really an alien, comes to Earth. But Ben and Co. learn that he's not what he seems.

Episode 5: Eon's Army
Eon's built up the equivalent of an army with Ben, Gwen, and Kevin copies. But the Ben copy, Albedo, escapes.

Episode 6: A Different 10
Max tells Ben and Co. about a new case he's looking into. Now, Ben must build up a new team.

Episode 7: Another Omnitrix
Revolving completely around Eon's quest, Albedo, Evil Gwen, and Evil Kevin try to find the Powers to activate the All-Power-Trix.

Episode 8: Kevin Leaves
Kevin goes on a quest in the Null Void, making Ben and Gwen's job harder.

Episode 9: Knight of the Villains
The Forever Knights hire Rojo and Clancy, and send them out to Ben and Gwen.

Episode 10: The Other Return of Vilgax
Vilgax escapes from Incarcecon and attacks Ben and Gwen. They must now destroy Vilgax.

Episode 11: Andromeda Trouble
Someone brainwashes the Andromeda aliens, Bivalvan, Galapagus, P'andor, Andreas, and Ra'ad, so they attack Ben and Gwen.

Episodes 12-13: BTMT Movie Season Finale Thingy!
Season Finale. Everything in Season 2 comes to a close as Eon gets the All-Power-Trix, and causes the greatest destruction in the history of Ben 10!