Goat Nibbler, a.k.a. Alduin, is the leader of the dragons and is the main enemy in Cock Nibbler's quest. The quest was provided by the Game Society Pimps gods in the episode, The Moose-Born, in order to film Season 6 of Skyrim For Pimps.
Goat Nibbler has the ability to resurrect other dragons. He is known to be the most powerful dragon throughout Skyrim.
In Main Quest Completed (6.31), Alduin was killed by Cock Nibbler and three ancient heroes, one of them named Ancient Traveler. Although Cock Nibbler returned to Nirn as a hero, the Game Society Pimps gods continues to abandon him for not completing the quest in a timely fashion.