AVENGERS (1963) #225

The return of the Black Knight! After the team is transported to 12th century Avalon, the Avengers find themselves face-to-face with the monstrous Fomor! Who will perish in this alternate realm? And will it be the forces of good, or evil, that conquer the day? Thor is attacked by security systems as he arrives at Avengers Mansion. The Thunder God is encased in quickly hardening plastanium, developed by Tony Stark.…