Thor, Vol. 1

Thor goes to try and talk to Odin, but is prevented by the palace guards and a mystic field that even Mjolnir cannot penetrate. Odin has his men move the Odinsword to the throne room, where he can pull it from the scabbard at a moment's notice. The group goes to seek Karnilla's help in breaching the mystic barrier. Thor barely manages to get through before it reseals itself. Thor then confronts Odin, only to have him reveal that it's not really Odin at all - it's Mangog sitting upon the Odinsword.