Thor, Vol. 1 #341A

No longer split between his mortal identity, Donald Blake, and the Thundergod, Thor finds himself in need of a new identity in which to live amongst humanity. But even as Thor tries to get his affairs in order in the realm of Midgard, Loki has sent Lorelei, his companion in mischief, to awaken the dragon Fafnir, who Thor fought once long ago... And who, even now, hungers for vegeance.