1. Captain Britain by Alan Moore and Alan Davis
So... almost certainly not what anyone was expecting, but for me the Alan Moore & Alan Davis run on Captain Britain is by far the best single comic story I've read. Some of that is almost certainly down to emotional attachment. This is not a story I read in graphic novel format, I read it as it happened, I even came into it halfway through, the starting point for me was 'The Candlelight Dialogues' that appeared in Might World of Marvel # 7 and the story won me over there and then.
When Moore took over he wrote the final page of Thorpe's last story and if there is ever an example of just what a great writer is Moore proves it in one page. Davis seems to respond as well, his superb art moves to another level, and great though he has been ever since, there is very little that matches those issues with Moore.
Everything gets turned on its head. The story becomes cosmic, the mad Jim Jaspers turns out to be a being of power, with the ability to warp reality to his will. This world was chosen to return Captain Britain to because he is not just a threat to the universe, but the very multiverse. We are introduced to the Fury the cybernetic killing machine that had wiped out all of the worlds superheroes (except one). It hunts Captain Britain to the end of the world and destroys him, the Jaspers creature, now referred to as the Jaspers Warp runs wild and destroys the reality...
But...
Captain Britain is returned to his own reality. There, in the main Marvel Universe, the Jasper's Warp is beginning all over again, more powerful than ever and this time if it is not stopped all of reality will collapse and fall...
There is more though: Captain UK the surviving hero from the previous reality, the games the 'gods' play and the consequences; the introduction of the alternate realities 'Captains' and the small fact that The Fury has followed Captain Britain across realities...
It is a magnificent piece of storytelling, the art and writing melding perfectly. This could well be a single standalone novel, it has a beginning a middle and end, is totally self contained. Moore builds an epic out of nothing, defining a hero over the course of his run, deepening it by bringing back characters that had not been seen since Claremont first created the strip bringing it all together in a manner that is as close to perfect as Moore has ever achieved - and the fact that Davis does the same visually is just the icing on the cake.
The series redefined a costume to the extent that it is simply THE Captain Britain costume; it introduced the idea of the different Earth numbers for the multiverses and gave the 616 to the Marvel Universe, it raises a backwater character to new levels, providing him with a title of his own, and even though it only lasted 14 issues we saw Captain Britain welcomed into the Marvel Universe proper, and brought his sister to prominence, enough that she would become a core member of the X-Men.
There is very little is wrong with this story, and I'm sure that many will not rate as highly as I. But it is worth a read, and perhaps, just perhaps it might win a couple of people over.