Other issues:
Professor X discovers that Frankenstein's monster is real, and has been found frozen in the arctic and has been transported back to a museum in New York. Xavier guesses that the Frankenstein is an android, possibly built by mutants and sends The X-Men to investigate. A scientist thaws the Monster and he begins destroying the museum, subduing the X-Men and escaping. They track him down on a boat bound for South America and fight him again. Professor X deduces that his only weakness is ice, and Bobby freezes the monster, causing him to explode. Xavier probed the monster's mind and discovers he was an android created by aliens, who sent him to earth as a peaceful ambassador before he malfunctioned and went berserk.
Second story: the origins of Jack O'Diamond - an accident that leaves him with diamond hands. Now he is trying to use young Scott Summers to make his entire body into diamond.