The Docile Dragon

The Docile Dragon was a creature which appeared in the Cartoon Network original series Ben 10, specifically the episode titled Shhh!

Description
Although named the Docile Dragon, this beast was anything but. Appearing as a heavyset dragon of the traditional European type, it possessed a pair of expansive leathery pinions, a forked tongue, fiery breath and a high degree of superhuman strength. It was tended to in a cave in the middle of a commune of hippies who had all taken a vow of silence so as not to awaken the dragon.

History
After Team Tennyson sought rest and refreshments in the commune whilst on their road trip, Ben ignored the warnings of the caretakers and disturbed the sleeping Docile Dragon with his childish racket. Doing battle with the beast in his Diamondhead configuration proved hopeless, but Ben was eventually able to soothe the dragon's aura before sealing it away in a casing of diamond, allowing its human attendants to give up their vigil and go back to regular life.