Published Sep 1969 by Marvel.
1st Printing. 1st appearance of Sauron. Cover pencils by Neal Adams. In the Shadow of...Sauron!, script bny Roy Thomas, pencils by Neal Adams, inks by Tom Palmer, colors by Neal Adams; The X-Men take an injured Havok to be treated by one of Xavier's old buddies, Dr. Karl Lykos; Lykos is an energy vampire and drains mutant life energy from Havok, turning himself into the evil Sauron; Angel takes off to investigate the flying dinosaur and is hypnotized by Sauron's powers. Letter from comics creator Don McGregor.