The Ultimate Sacrifice, Ben 10 Wiki

The Ultimate Sacrifice is the nineteenth episode of the third season of Ben 10: Ultimate Alien, and the thirty-ninth episode overall. Ben as Humungousaur and the rest of the team are fighting a red robot in the middle of the streets. After the robot takes out Kevin, it begins strangling Humungousaur, so Humungousaur evolves into Ultimate Humungousaur to fight the robot and proceeds to annihilate it. Both Gwen and the robot beg Ultimate Humungousaur to stop, only for him to angrily shout out that

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Ben 10 Ultimate Alien, Ultimate Sacrifice