I first got to know Son of Satan, as a kid, as a member of the Defenders. This giant issue is the first time he met the group. Storywise, it’s basically just a big fight against Asmodeus, who is yet-another version of the devil for the Marvel Universe. Hulk gets kidnapped by The Sons of Satannish, and the team goes to rescue him.
Creators: Len Wein, Gil Kane
For the complete history of the MU, year by year, go here.