Incursean War Arc

The Incurseans
The Incurseans are a frog - like species from a planet that was accidentaly destroyed by a Warrior wielding Ascalon. Since then the Incurseans have been roaming space in spaceships conquering other planets.

First Encounter
The Incurseans make their debut in the episode X = Ben + 2. In the episode the daughter of the Incursean Emperor Milleous is kidnapped. The daughter's name is Attea. Sevenseven kidnapped her for the ransom. The Incurseans are shown to be vicious and destroy Pluto, threatening to do the same with Earth if Attea is not returned. Attea does return, and reveals that she has promised to pay Sevenseven double the amount of ransom if he helps Attea to overthrow Milleous. Attea and Sevenseven however are defeated by Ben (Who just had a mind - blowing exprience with Alien X, his newest alien) as Swampfire, Gwen and Kevin. Milleous then thanks the team for the effort and promises to leave Earth alone.

Business with Simian and Argit
In Simian Says, at the end of the episode it is seen that Simian took the DNA Repair Guns and sold them to the Incurseans. Why the Incurseans would buy the guns as it does not have any apparent use to them, is unclear though it could be that they were tricked by Simian.

In So Long, and Thanks for All the Smoothies Milleous hires Argit to get the Anihilaarg from a Contemelia ship. Argit meets Ben, Rook and the Vreedle Brothers aboard the ship. Argit eventually escapes with the Anihilaarg intending to double - cross the Incurseans and the Incurseans follow Argit down to Earth aboard their ship, with Rook, Ben and the Vreedle Brothers tagging along. The brawl continues to a Smoothy store where the Anihilaarg is accidentaly activated and it destroys the entire universe. Ben as Alien X however re-creates the universe and thinking that the Anihilaarg is a dud, the Incurseans leave.

Their Conquest across the Galaxy
The Incurseans are the major antagonists of the third arc of Ben 10 Omniverse. In this arc, Attea is back as Milleous's general and the Incurseans plot to take over the entire galaxy.

In Tummy Trouble, Ben and Rook are flying in space on the Proto-TRUK, making their way to Peptos XI, where the Gourmands live. Suddenly while aboard they are attacked by the Incurseans. Ben wonders what they might be doing and he turns into Big Chill to fight them.