Ben 10: Alien Force
Kevin has arranged a meeting for Ben with the Forever Knights, who need help in slaying a dragon they have kept captive underneath their castle for 1,000 years. After teaming up with the Knights’ mightiest warrior, Sir Connor, in a failed attempt to destroy the dragon, Ben notices that the dragon appears to be trying to communicate. The team leaves the Knights behind and tracks the dragon to a warehouse where its spaceship is being held. Ben fits the dragon with a universal translator so it can speak, and it reveals that he is an alien mapmaker, but was captured by Judith and the Forever Knights. Ben helps the dragon find its spaceship, and it departs in peace. He then starts to question the motives of the Forever Knights.