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[Linked Image from milehighcomics.com]

One more issue worthy of mention, Byrne's first writer/artist story for Marvel, in MARVEL TWO-IN-ONE 50, April 1979
https://readcomiconline.li/Comic/Marvel-Two-In-One/Issue-50?id=63413

Where the Thing is given a cure by Reed Richards that should make Ben Grimm human again. But unfortunately, Grimm has been the Thing for too long for it to work, at this stage of his mutation. So when left alone, Grimm has the idea to use Richards' time machine to go back to 1961, and administer the cure to himself at his earliest stage of his mutation, so the formula will work on him.

It's a nice character exploration, of how the Thing was portrayed in his earliest days, and how the character had evolved up to that point over 18 years (from 1961-1979), the things of two eras meeting, where they could be contrasted side by side. An impressive opening offering by Byrne as writer/artist
And a precursor of what Byrne would do in FANTASTIC FOUR 232-293 as writer/artist, with a solid grasp of science fiction, time travel paradoxes, and a good understanding of the FF characters from the earliest days of the series, tapping into the appeal of those earliest issues, returning those elements to the series during his run.
https://readcomiconline.li/Comic/Fantastic-Four-1961/Issue-232?id=26930

Also interesting to see the FF issues from 1979-1980, circa issues 209-221, when Marv Wolfman was writing the series, and Byrne was just pencilling the series, inked by Joe Sinnott, where Byrne was not at the creative helm, just one part of the FF creative team.
https://readcomiconline.li/Comic/Fantastic-Four-1961/Issue-209?id=26904

The Moench and Sienkiewicz/Sinnott creative team (FF 219, 222-231, June 1980-June 1981), in the year just preceding the start of Byrne'e run with issue 232, is also an interesting contrast.
https://readcomiconline.li/Comic/Fantastic-Four-1961/Issue-219?id=26915