SevenSeven

Sevenseven is a villain in the series ben 10 alien force and ultimate alien, first appearing in the alien force episode X = Ben + 2. It is said that he is of the same race, sotorraggian,as Sixsix, but 11 times more dangerous.he never speaks english like sixsix, but doesnt say the same words as sixsix does. In ben 10, it is said that Sevenseven is Sixsix's older brother, probably 11 years older, although Sevenseven isn't a mutant like Sixsix is, but he was experimented on and had nanobots fused into his skin. he can transform both of his hands into machine guns and a buzzsaw. he also has 2 tentacle cannons coming out of his jetpack discs grenades stun grenades flash bangs and homing missiles.

Ultimate Alien
He reappeared in the Ultimate Alien episode for a few seconds, Hit 'Em Where They Live, teaming up with Zombozo, Charmcaster, and Vulkanus. He is seen targeting Sandra Tennyson but fights Max Tennyson instead and flys away when Max puts a pole into his jetpack.

Video Game
Sevenseven appears in the game Ben 10 Ultimate Alien: Cosmic Destruction in the Devil's Tower. He is one of the many bounty hunters on Earth who are hired to take the Potis Altiare. After a failed attempt to kill Ben, including shooting him, throwing grenadesand firing homing missiles, he fights Ben himself but is defeated.

Trivia

 * In the Pop-up edition of Ben 10, Sixsix gets his name from the weapons on his wrists, with six holes to launch small missiles; Sevenseven could have the same reason.
 * Gwen said that Sevenseven is eleven times more dangerous than Sixsix, probably because 66 + 11 = 77.