Jim Shooter and Al Plastino bring back the Parasite in Action 361 (March 1968).
An alien geographer exploring the Earth finds an unusual cloud, which registers as a life-form. He brings it aboard his ship, and concentrates it, which restores the Parasite back to life. The Parasite drains the geographer, and heads down to Earth.
The Parasite still is aware that Superman is Clark Kent. He takes on the identity of a reporter, drawing the needed skills and abilities from Lois Lane and Jimmy Olsen, even from Perry White as he hires the man for the Daily Planet. The Parasite sticks close to Clark, but only draws his energy from him as the Parasite.
This plan works extremely well. The Parasite never lets his presence be known, so Superman has no idea what is weakening him.
When the Parasite has drained Superman sufficiently, he goes on the attack. And Superman has been weakened so much that the Parasite should have won this fight. But the geographer recovered, and comes up form behind, trapping Parasite in the device he used to gather him as a cloud int he first place.
Surprisingly, after two great appearances the Parasite is not seen again until the mid-70s.
Otto Binder and Kurt Schaffenberger explore the wonders of computer dating in this story.
Linda gets matched with a boy who seems to have super-powers, speak Kryptonian, and know that she is Supergirl. She is wary enough to not reveal anything, but also intrigued.
When she comes to his aid as Supergirl, he rudely rebuffs her, claiming to have interest only in Linda. This really throws her.
He finally tries to prove Linda is Supergirl, at the risk of her life. She gets out of it, and he confesses that the he faked his Kryptonian stuff, thinking she really was Supergirl.
And we are meant to laugh as he winds up matched with an ugly girl.
But he was right. And although he lied about who he was, Linda also lies about who she is.
I think they were better suited to each other than Linda thought. No wonder she never gets a stable boyfriend, and is content with her dalliances with a merboy, a horse, and an alien living in the distant future.