Fafnir (Marvel Comics) entities is stopped when Thor agrees to go to Hel's realm willingly. Fafnir later reappears in the 2011 limited series "Avengers Prime" in the aftermath of the "Siege" storyline as, at first, an adversary then ally of Thor, Tony Stark and Steve Rogers with several legions of ogres and elves in battle against a Twilight Sword wielding Hela and her army. Fafnir was originally a normal man until transformed by the properties of a magical pool into a large dragon. Fafnir retains his intellect and speech, possesses superhuman strength and durability, and the ability to breathe fire and cast illusions.
Monster Swamp Monster Swamp" which went into greater detail with the cast and creators to discuss Cassidy's dealings with DeBlanc and Fiore and why Jesse's so focused on converting Annville's biggest sinner, Odin Quincannon. Showrunner Sam Catlin was interviewed for the segment, and stated "Cassidy's sort of figured out that DeBlanc and Fiore aren't vampire vigilantes. Now he realises what they want is Jesse's power." Catlin then acknowledges that Cassidy is rather curious of the two fellows, stating, "At first he just wants to know a little bit about more about what it is that they want and what are they after;