Ok, how about this for an idea. We take it in turns to post a favourite (British spelling) comic cover every day. This went really well on the comic fan website that I used to frequent. What we tried to do was find a theme or subject and follow that, until we all got bored with that theme. I'd like to propose a theme of letters of the alphabet. So, for the remainder of October (only 5 days) and all of November, we post comic cover pictures associated with the letter "A". Then in December, we post covers pertaining to the letter "B". The association to the letter can be as tenuous as you want it to be. For example I could post a cover from "Adventure Comics" or "Amazing Spider Man". However Spider Man covers can also be posted when we're on the letter "S". Adventure Comic covers could also be posted when we're on the letter "L" if they depict the Legion of Super Heroes. So, no real hard, fast rules - in fact the cleverer the interpretation of the letter, the better, as far as I'm concerned.
And it's not written in stone that we have to post a cover every day. There may be some days when no cover gets posted. There's nothing wrong with this, it just demonstrates that we all have lives to lead.
If everyone's in agreement I'd like to kick this off with one of my favourite Action Comic covers, from January 1967. Curt Swan really excelled himself here.
Without the TV show Mr. Zero might have disappeared never to be seen again, but he returned as Mr. Freeze.
As the TV show was winding down he did return in the comics. It was mentioned that he had simply changed his name.
Aunt Harriet was undergoing cryosurgery and due to an equipment failure the only way the surgery could be finished is to use Mr. Freeze’s ice gun. Holy coincidence, Batman! All ends well for Aunt Harriet.
However, Gardner Fox had other plot options. Captain Cold would have worked just as well. And Fox and Schwartz were certainly aware of Captain Cold. Fox had even included him in an early JLA adventure (#5). Or, Batman could have just called his best friend, and Superman could have saved the day with his super-breath.
Or, a different, earlier Mr. Freeze (1957) could have been revived.
Actually, there was no reason to initially create Mr. Zero in the first place since a Mr. Freeze already existed and at the time Jack Schiff edited the Batman titles and Blackhawk. This would not have been unprecedented since both Batman and the Blackhawks each fought a Catman/Cat-Man, although they were different characters.
To add to the coincidence, Mr. Freeze was really a scientist named Thurman and Poison Ivy, who teamed up with Mr. Freeze in the movies was played by Uma Thurman. Holy double coincidence, Batman!!
Zatanna joins the team (finally) in Justice League of America #161 (D'78).