Incursean

The Incurseans are a race of militaristic and technologically-advanced frog-like aliens from an unnamed planet that was destroyed long ago.

Anatomy
The Incurseans look like anthropomorphic toads. Some male Incurseans have either slim bodies, warty toad-like heads and yellow eyes. Others have larger forms with an even greater toad-like appearance.

Female Incurseans look little like the males due to having female mammalian traits. Thus, they look almost completely human except for green skin, yellow sclera with red-pupiled eyes, and a slightly larger mouth.

Powers/Abilities
Incurseans have a frog-like tongue that is long, sticky, and prehensile.

Similar to Earth frogs, Incurseans possess enhanced jumping abilities.

Weaknesses
Incurseans appear to be very sensitive to smells like burning rubber, compost, and even Methanosians, which causes them to faint.

History
The Incurseans have been a violent, spacefaring race for millennia. Their original homeworld was divided into many factions in an eons-long civil war. On day, an unknown warrior attempted to reunite his planet with the power of the sword Ascalon, which he stole from the Galvan Azmuth. The result of misusing the sword's power, however, ended up destroying the Incursean homeworld.

Fortunately, many Incurseans were able to escape the planet's destruction and have been space-faring to this day. Under the leadership of the tyrannical Emperor Milleous, the Incurseans have stepped up their game to become even more hyper aggressive warrior-gangsters out for galactic conquest around the universe.

Milleous' daughter, Princess Attea, worked her way back into her father’s good graces. She was once a general and has been given command of the Incurseans' celebrated Calaveras Legion. Attea did her best to act like a good and loyal soldier to her father, but had her own schemes going on behind the scene.

After several failed attempts in conquering the home planets of the Revonnahganders, the Chimera Sui Generi, and the Gourmands, the Incurseans lead a full-frontal assault on the Earth. Despite the capture of Milleous, their Cerebrocrustacean ally Dr. Psychobos unleashed mutated To'kustars, prompting the Plumbers to begrudgingly exile Ben Tennyson and surrender themselves to the Incurseans.

However, Earth was spared from Incursean control because Attea manipulated Ben and his team into liberating the Plumbers and bringing Milleous to justice, enabling her to become the Incurseans' current empress. Along these lines, she has also developed a crush on Ben's Incursean form Bullfrag. In the aftermath, the mutant To'kustars were sent to the Null Void and both Milleous and Psychobos were taken into Plumber custody.

Omnitrix Transformation
The Omnitrix's Incursean representative is named Bullfrag, who first appeared in the Omniverse episode "The Frogs of War: Part 2". According to Ben, he was unlocked by Azmuth off-screen during "The Frogs of War: Part 2". Bullfrag solely appears in Omniverse.