The Return of Over-Mind

Upon the destruction of their homeworld (a.k.a. Earth-S), the surviving members of the Squadron Supreme escaped to the dimension where most of Marvel's superhero comics take place.

The Squadron's arrival had an unusual effect on Over-Mind, who had once enslaved the team (Defenders #113).

Although six psychics collectively known as the Chorus had subdued Over-Mind, he returned to his original personality of the warlord Grom and soon regained mental control of the Squadron Supreme (Quasar #13-14).

The mysterious Stranger, a former enemy of Over-Mind, intervened to stop the powerful foe yet again. Numerous members of the Watchers witnessed the battle, as did the admittedly outclassed hero called Quasar (#15-16).

Mark Gruenwald wrote Quasar #13-16 (August-November 1990). Mike Manley penciled those issues.

Continued in Quasar

Quasar may have been a Defender for only a day (back when he was still called Marvel Man), but several story lines from the original run of the Defenders continued in Quasar's solo series, which took the hero into the far reaches of the cosmos.

Quasar #19, for example, unexpectedly brought back Gargoyle—one of several heroes who appeared to die in New Defenders #152 but later returned.

Quasar #19-20 also featured Red Guardian and Presence, who left Earth in Defenders #56 and were last seen in The Incredible Hulk #258-59.

Mark Gruenwald wrote Quasar #19-20 (February-March 1991). Greg Capullo penciled both issues.