Bates, Swan and Blaisdel conclude the Karb-Brak story in Action 463 (Sept. 76). Released in late June of 1976, it made the most of the Bicentennial fervor.
Although it resolves the Karb-Brak storyline in its; last few pages, the bulk of the story takes place in Philadelphia, in advance of the signing of the Declaration of Independence.
Swan’s art is superb on the historical stuff. Clark has no memory of any powers, or being from another era, thanks to Karb-Brak. But his natural inclination to helping people starts to reveal his abilities.
It’s not long before he stumbles across a plot to disrupt the signing and steal the document.
With his memory back, he returns to the present, and captures the ailing alien. Superman operates on him, curing his allergy, and sealing him in his human form, with no memory of being anyone else.
About the happiest ending it could have.