AVENGERS (1963) #115 (FN)

Script by Steve Englehart. Pencils by Bob Brown. Inks by Mike Esposito. Cover by John Romita and Mike Esposito.

The Avengers fly to Great Britain to visit their fellow avenger, the Black Knight! But when the team approaches Garrett Castle, an invisible barrier repulses them! While Earth's Mightiest Heroes are devising a way to pierce the mystical barrier, a group of troglodytes attack! Where did these grotesque creatures come from?