Bens childhood crush, Kai Green, asks Ben and Rook for help when her grandfather is kidnapped by the Forever Knights who are after a mysterious sword.\r<br>\r<br>Watch more Ben 10: Omniverse on Cartoon Network!\r<br>Watch more videos and play Ben 10: Omniverse games: \r<br>\r<br>Watch more videos on the go, get the Cartoon Networks Watch And Play app here:\r<br>\r<br>\r<br>Check out our Cartoon Network Facebook pages:\r<br>\r<br>
