Defenders (1972 1st Series) comic books with issue numbers 15-16
"Panic Beneath the Earth!" Part 1 of 2. Guest-starring Professor Xavier. Script by Len Wein. Art by Sal Buscema (layouts) and Klaus Janson (finishes). Cover by John Buscema, Mike Esposito, and John Romita (touch ups). It's an epic encounter beneath the Carlsbad Caverns as Professor X, Dr. Strange, Nighthawk (in his new costume), Valkyrie, and the Hulk battle the Blob, Lorelei, Mastermind, Unus, and Magneto! Flashback cameos by Captain America, Thor and the Vision to recap Magneto's defeat in Avengers #111. (Notes: This story occurred during the 5-year period when the X-men series was in reprint. During this time Magneto battled Marvel's other superhero teams including the Fantastic Four, Inhumans, and Avengers. The Defenders title returns to monthly publication with this issue. The letters page contains Marvel Value Stamp series A #8 Captain America by John Buscema.) Cover price $0.25.
"Alpha, the Ultimate Mutant!" Part 2 of 2. Guest-starring Professor Xavier. Script by Len Wein. Pencils by Sal Buscema. Inks by Mike Esposito. Cover by Gil Kane and Frank Giacoia. The Defenders have gone down to defeat in New Mexico at the hands of Magneto and Alpha, the Ultimate Mutant! And now the Master of Magnetism and his mutants travel to New York City and take over the United Nations headquarters! With Alpha at his side, Magneto demands the subjugation of the world! However, as time goes by the Ultimate Mutant metamorphoses from a simple man into a godlike being. And when Doctor Strange, Professor Xavier, Valkyrie, Nighthawk, and the Hulk attack Magneto again, Alpha wonders if he's fighting on the side of good or evil. Will Alpha turn against the Master of Magnetism and lead the Defenders to an unexpected victory? (Notes: Magneto appears next in Uncanny X-Men 103 and 104. Alpha returns many years later in Quasar 14. The letters page contains Marvel Value Stamp series A #44 the Absorbing Man by Jack Kirby.) 32 pages Cover price $0.25.