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I have dreamed for millennia of this moment! An entire universe in my image!
I will bestow upon you the ultimate treasure... eternal youth!
~ Maltruant betrays Psychobos, trying to turn him into an infant.
Please! I travel back and forth through time! You don't think I saw that coming?
Maltruant is the final antagonist of Ben 10: Omniverse, serving as the main antagonist of the final arc The Time War. He is a rogue, powerful and psychotic Chronosapien who sought the domination of time itself and the death of Ben Tennyson.
According to Professor Paradox, Maltruant is bent on ruling all of time and existence. For achieving such goal, he masterminded the past Time War. Fortunately, he was defeated by the end of this particular war. To ensure that he wouldn't be able to start another war and his followers wouldn't be able to find him and restored him, Paradox took him apart and hid the incapacitated individual parts of Maltruant's body throughout space and time. However, over time, Maltruant would slowly "pull himself back together," eventually reforming the majority of his body.
Events in the series
Maltruant was first mentioned by Ben 10,000 in Ben Again when his temporal beasts went on a cross-dimensional rampage.
In "Fight at the Museum", he sent Subdora and Exo-Skull to steal the "Key to Time" for him, and they succeeded in their mission.
In "It's a Mad, Mad, Mad Ben World: Part 1", he sought to repair himself and become whole again, seeking to regain control of the time streams. He hired Dr. Psychobos to help, knowing Azmuth would never assist him in any dimension. After successfully being restored, Maltruant turned on Dr. Psychobos, easily defeated Ben Prime and Ben 23, and left Mad Ben's dimension with his minions to restart the Time War, leaving Mad Ben to deal with his alternate dimension counterparts and Dr. Psychobos.
In "Let's Do the Time War Again", Maltruant was shortly seen in a pocket dimension where Eon gave him two Time Beast eggs and declared that he would win the Time War before it would even begin.
In "Secret of Dos Santos", he created portals for Subdora to get Exo-Skull and one of his components.
In "The End of an Era", he came to the time period of Ben 10,000 to steal the Anihilaarg and the Dwarf Star so he can create a more deadly weapon.
In "A New Dawn", Maltruant traveled back in time and, due to Ben and Rook's interference, stopped in 1773 where he bartered transport repairs from Vilgax in exchange for a Chronosapien Time Bomb. He then traveled back to the very beginning of the universe and snuck aboard the Contemelia's ship, where he switched their Anihilaarg with his own in order to recreate the universe in his image. He was eventually defeated and his components were scattered across time and space by Professor Paradox, thus enclosing himself in a never-ending time loop of being defeated, rebuilding himself, and being defeated again without knowing it.
Maltraunt is portrayed as an intelligent, pompous, vain, and cunning egotist who desires nothing less than eternal dominion over reality. Along with this, he is shown to be a manipulative and treacherous sadist who enjoys toying with enemies and even betraying former allies once he no longer needed their help. He is also known to brag once he feels he is about to win which has led to his own defeat before.