Once Again the Most Notable Thing is the Letters Page
This is a substandard Fantastic Four adventure which has Diablo emerging from underground (remember the Fantastic Four just left him for dead without verifying anything). And decides to turn a Dragon Man model that a professor at State University is making 'for research purposes' into a real live Dragon Man to menace the FF who are on campus so Reed can give a speech. There is a ton of silliness here, including a dangerous lake on a college campus, Sue trying to reason with Dragon Man because it worked for Romulus and Remus and King Kong, etc. etc.
There's really only two things in this issue that make it stand out from the pack at all. One is the cameo appearances of Professor Xavier and Scott (Cyclops) Summers, and Peter Parker.
The other (and probably most notable thing about this issue) is in the letters page. If you remember, a few issues back, future 'Game of Thrones' writer George R.R. Martin wrote in pointing out Stan Lee's laziness at bringing back the seemingly dead Red Ghost without explanation. Stan's response was to offer a No-Prize for the reader who could best explain how the Red Ghost was able to come back. Well in this issue's letter column it's finally awarded when none other than the teenaged future game designer (of 'Runequest', 'Dungeons & Dragons', 'Champions', 'Call of Cthulhu', 'Stormbringer' and other roleplaying games) Steve Perrin, submits a convoluted explanation to cover Stan's goof.