Found it!

The rock guys are Kronans and although I do not think they make another appearance after the first appearance of Thor until around 2009 Korg, one of the guys who fought Thor in that issue (that was unnamed in that issue) makes considerable appearances later in the Planet Hulk and World War Hulk story lines.

If the race is not included in the Thor issue then Korg I think should be at least, even if he is not named.

Let me know if I miss some important ones...but yea, the shi'ar and the Brood should both be in...and both have been encountered. Brood show first in late 60's, shiar in early 70's

I believe yes on both of those.

The character rule applies to groups as well. Any group with more then 10 appearances total (no matter the time frame) will be included. This is just to keep down on the mess of 1 and 2 issue only groups.

What about the Rock guys in Thor's first appearance? I know they do not really appear again until just recently in comics history, but should those be included?

Also, did you already include the Shi'ar and the Brood? or are you even that far in the order for those guys to appear?

I was just curious because I just finished reading Daredevil 28 and wondered who those aliens were, and if they ever appear again, but did not see any notes on the issues page on your site.

I have both the Skrull and Kree in as groups. If more then like 1 solo alien appears I will add them as a group on that issue (if I missed some let me know)

That is generally my rule of thumb. More then 1 member of a group must appear in an issue (active member actually) in order to attach that group to the issue (otherwise there would be a lot of captain america issues saying the avengers were involved)

In the order, do you list out what species of alien appears in certain issues?

Such as when the Skrulls appear you mention it in the notes like maybe a team would be?