In the ’70s, the voluntary Comics Code weakened, and supernatural characters came roaring back. Marvel here attempted to make a super-team of some of their monster characters, which obviously failed, since they never reunited. (Although recently the team was revived with several of the original monsters.)
I have this comic–duh, it had Ghost Rider in it–and it’s not that great. I was never a fan of Franks Robbin’s art, although he ended up drawing a lot of early Ghost Rider appearances, including his guest stint in Human Fly #2. If the guy who did the cover drew the interior art, they might have had something.
The story was no great shakes either. Especially inane is GR’s fear of Mobius’ fangs. Er, Gr was a skeleton!! Also, Mobius was vulnerable to GR’s flames (as they established a few panels earlier), and since GR is covered in hellfire, I’m not sure how Mobius could have bitten him anyway. Meanwhile, the bad ‘tragic’ ending is entirely unaffecting. In any case, GR, Werewolf by Night, Morbius the Vampire and the Man-Thing when their separate ways.
Marvel must have copyrighted the “Legion of Monsters” thing, though, for they had a short-lived black & white horror magazine by they title, and as noted, the team itself was quasi-revived recently, although I haven’t seen any of those.