It’s the first appearance of The Sphinx. I always thought he was a Marvel Elder, but he’s not. He’s just really powerful, and wants to be immortal.
This leads to a big space epic. Modern Nova is solely associated with space epics, but in the early days it took several issues to establish this as part of the Nova gestalt.
Sphinx is trying to steal Nova’s powers. In the final battle, he runs away and promises he’ll be back again.
Yes, it took six issues to tell that simple story.
Creators: Marv Wolfman and Sal Buscema