Conway, Giffen and Wood conclude the Vulcan story in All-Star Comics 61 (July/Aug 76).
Picking up from the end of the previous issue, Green Lantern and Dr. Fate do their best against Vulcan. Dr. Fate looks to be more on the guy's power level, but winds up disastrously defeated, and Green Lantern rushes to the other JSA members for help.
There is a brief interlude with Carter Hall, in his capacity as archaeologist, being presented with an apparent survivor from the sunken continent of Lemuria. He doesn't spend too much time with the odd creature, though, changing into Hawkman to join the fray against Vulcan.
Wildcat, Power Girl and Star-Spangled Kid stand around and watch their headquarters burn down. I guess they are all so traumatized they don't think to take any action to stop it. Joan Williams, the Flash's wife, shows up and convinces her husband to ditch the team in their hour of need and come home. Dr. Mid-Nite does show up to take his place, although the power of being blind is not quite an adequate replacement for super speed.
As the team fights Vulcan, Power Girl comes across an alien ship and a strange creature. They battle, and the contact she has with the being informs her of its true nature, and how it turned Pike into Vulcan in a flowed attempt to save his life. This is a very Giffen page, more than any other in the issue.
Power Girl explains to the others about the alien. When Vulcan learns the creature was behind his change he kills it. But the creature had already revealed Vulcan's vulnerability to light. Star-Spangled Kid uses his cosmic rod on Vulcan, and it sure looks like he kills the guy, although he actually just sent him into limbo, as will be revealed in All-Star Squadron in 1983.
The story ends with Dr. McNider announcing that Dr. Fate is near death.
The story continues in the next issue.
Oh, and I guess I should mention that Joan Williams had last been seen the previous year in the Flash, and would next be seen the following year in the Flash.